Slixfeed/slixfeed/sqlite.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""

TODO

0) Function "mark_feed_as_read": see function "maintain_archive"

1) Function to open connection (receive db_file).
   Function to close connection.
   All other functions to receive cursor.

2) Merge function add_metadata into function import_feeds.

3) SQL prepared statements.

4) Support categories;

"""

from asyncio import Lock
# from slixfeed.data import join_url
from slixfeed.log import Logger
from sqlite3 import connect, Error, IntegrityError
import sys
import time

# from eliot import start_action, to_file
# # with start_action(action_type="list_feeds()", db=db_file):
# # with start_action(action_type="last_entries()", num=num):
# # with start_action(action_type="get_feeds()"):
# # with start_action(action_type="remove_entry()", source=source):
# # with start_action(action_type="search_entries()", query=query):
# # with start_action(action_type="check_entry()", link=link):

CURSORS = {}

# aiosqlite
DBLOCK = Lock()

logger = Logger(__name__)

def create_connection(db_file):
    """
    Create a database connection to the SQLite database
    specified by db_file.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    conn : object
        Connection object or None.
    """
    time_begin = time.time()
    function_name = sys._getframe().f_code.co_name
    message_log = '{}'
    logger.debug(message_log.format(function_name))
    conn = None
    try:
        conn = connect(db_file)
        conn.execute("PRAGMA foreign_keys = ON")
        # return conn
    except Error as e:
        logger.warning('Error creating a connection to database {}.'.format(db_file))
        logger.error(e)
    time_end = time.time()
    difference = time_end - time_begin
    if difference > 1: logger.warning('{} (time: {})'.format(function_name,
                                                             difference))
    return conn


def create_tables(db_file):
    """
    Create SQLite tables.

    Parameters
    ----------
    db_file : str
        Path to database file.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        entries_properties_authors_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties_authors (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                name TEXT,
                url TEXT,
                email TEXT,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_properties_contributors_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties_contributors (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                name TEXT,
                url TEXT,
                email TEXT,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_properties_contents_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties_contents (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                text TEXT,
                type TEXT,
                base TEXT,
                lang TEXT,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_properties_links_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties_links (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                url TEXT,
                type TEXT,
                rel TEXT,
                size INTEGER,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_properties_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL,
                identifier TEXT,
                link TEXT,
                title TEXT,
                title_type TEXT,
                summary_text TEXT,
                summary_lang TEXT,
                summary_type TEXT,
                summary_base TEXT,
                category TEXT,
                href TEXT,
                comments TEXT,
                rating TEXT,
                published TEXT,
                updated TEXT,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_state_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_state (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                rejected INTEGER NOT NULL DEFAULT 0,
                read INTEGER NOT NULL DEFAULT 0,
                archived INTEGER NOT NULL DEFAULT 0,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        entries_properties_tags_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS entries_properties_tags (
                id INTEGER NOT NULL,
                entry_id INTEGER NOT NULL,
                term TEXT,
                scheme TEXT,
                label TEXT,
                FOREIGN KEY ("entry_id") REFERENCES "entries_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        # TODO Rethink!
        # Albeit, probably, more expensive, we might want to have feed_id
        # as foreign key, as it is with feeds_properties and feeds_state
        feeds_preferences_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_preferences (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL UNIQUE,
                enabled INTEGER NOT NULL DEFAULT 1,
                mutable INTEGER NOT NULL DEFAULT 0,
                filter INTEGER NOT NULL DEFAULT 1,
                priority INTEGER NOT NULL DEFAULT 0,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_properties_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_properties (
                id INTEGER NOT NULL,
                url TEXT NOT NULL UNIQUE,
                identifier TEXT,
                title TEXT,
                title_type TEXT,
                subtitle TEXT,
                subtitle_type TEXT,
                version TEXT,
                encoding TEXT,
                language TEXT,
                rating TEXT,
                entries INTEGER,
                icon TEXT,
                image TEXT,
                logo TEXT,
                ttl TEXT,
                updated TEXT,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_properties_links_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_properties_links (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL,
                url TEXT,
                type TEXT,
                rel TEXT,
                size INTEGER,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_rules_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_rules (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL UNIQUE,
                type TEXT NOT NULL,
                keywords TEXT,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_state_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_state (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL UNIQUE,
                renewed TEXT,
                scanned TEXT,
                status_code INTEGER,
                valid INTEGER,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_statistics_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS statistics (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL UNIQUE,
                offline INTEGER,
                entries INTEGER,
                entries INTEGER,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        feeds_properties_tags_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS feeds_properties_tags (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL,
                term TEXT,
                scheme TEXT,
                label TEXT,
                FOREIGN KEY ("feed_id") REFERENCES "feeds_properties" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        # TODO
        # Consider parameter unique:
        # entry_id TEXT NOT NULL UNIQUE,
        # Will eliminate function:
        # check_entry_exist
        filters_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS filters (
                id INTEGER NOT NULL,
                key TEXT NOT NULL,
                value TEXT,
                PRIMARY KEY ("id")
              );
            """
            )
        settings_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS settings (
                id INTEGER NOT NULL,
                key TEXT NOT NULL,
                value INTEGER,
                PRIMARY KEY ("id")
              );
            """
            )
        status_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS status (
                id INTEGER NOT NULL,
                key TEXT NOT NULL,
                value INTEGER,
                PRIMARY KEY ("id")
              );
            """
            )
        tagged_feeds_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS tagged_feeds (
                id INTEGER NOT NULL,
                feed_id INTEGER NOT NULL,
                tag_id INTEGER NOT NULL,
                FOREIGN KEY ("feed_id") REFERENCES "feeds" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                FOREIGN KEY ("tag_id") REFERENCES "tags" ("id")
                  ON UPDATE CASCADE
                  ON DELETE CASCADE,
                PRIMARY KEY ("id")
              );
            """
            )
        tags_table_sql = (
            """
            CREATE TABLE IF NOT EXISTS tags (
                id INTEGER NOT NULL,
                tag TEXT NOT NULL UNIQUE,
                PRIMARY KEY ("id")
              );
            """
            )
        cur = conn.cursor()
        # cur = get_cursor(db_file)
        cur.execute(entries_properties_table_sql)
        cur.execute(entries_properties_authors_table_sql)
        cur.execute(entries_properties_contents_table_sql)
        cur.execute(entries_properties_contributors_table_sql)
        cur.execute(entries_properties_links_table_sql)
        cur.execute(entries_properties_tags_table_sql)
        cur.execute(entries_state_table_sql)
        cur.execute(feeds_properties_table_sql)
        cur.execute(feeds_properties_links_table_sql)
        cur.execute(feeds_properties_tags_table_sql)
        cur.execute(feeds_preferences_table_sql)
        cur.execute(feeds_rules_table_sql)
        cur.execute(feeds_state_table_sql)
        cur.execute(filters_table_sql)
        # cur.execute(statistics_table_sql)
        cur.execute(settings_table_sql)
        cur.execute(status_table_sql)
        cur.execute(tagged_feeds_table_sql)
        cur.execute(tags_table_sql)


def get_cursor(db_file):
    """
    Allocate a cursor to connection per database.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    CURSORS[db_file] : object
        Cursor.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    if db_file in CURSORS:
        return CURSORS[db_file]
    else:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            CURSORS[db_file] = cur
    return CURSORS[db_file]


async def import_feeds(db_file, feeds):
    """
    Insert a new feed into the feeds table.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feeds : list
        Set of feeds (Title and URL).
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            for feed in feeds:
                logger.debug('{}: feed: {}'
                            .format(function_name, feed))
                url = feed['url']
                title = feed['title']
                sql = (
                    """
                    INSERT
                    INTO feeds_properties(
                        title, url)
                    VALUES(
                        ?, ?)
                    """
                    )
                par = (title, url)
                try:
                    cur.execute(sql, par)
                except IntegrityError as e:
                    logger.warning("Skipping: " + str(url))
                    logger.error(e)


async def add_metadata(db_file):
    """
    Insert a new feed into the feeds table.

    Parameters
    ----------
    db_file : str
        Path to database file.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                SELECT id
                FROM feeds_properties
                ORDER BY id ASC
                """
                )
            ixs = cur.execute(sql).fetchall()
            for ix in ixs:
                feed_id = ix[0]
                # insert_feed_properties(cur, feed_id)
                insert_feed_status(cur, feed_id)
                insert_feed_preferences(cur, feed_id)


def insert_feed_status(cur, feed_id):
    """
    Set feed status.

    Parameters
    ----------
    cur : object
        Cursor object.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: feed_id: {}'
                .format(function_name, feed_id))
    sql = (
        """
        INSERT
        INTO feeds_state(
            feed_id)
        VALUES(
            ?)
        """
        )
    par = (feed_id,)
    try:
        cur.execute(sql, par)
    except IntegrityError as e:
        logger.warning(
            "Skipping feed_id {} for table feeds_state".format(feed_id))
        logger.error(e)


def insert_feed_preferences(cur, feed_id):
    """
    Set feed preferences.

    Parameters
    ----------
    cur : object
        Cursor object.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: feed_id: {}'
                .format(function_name, feed_id))
    sql = (
        """
        INSERT
        INTO feeds_preferences(
            feed_id)
        VALUES(
            ?)
        """
        )
    par = (feed_id,)
    try:
        cur.execute(sql, par)
    except IntegrityError as e:
        logger.warning(
            "Skipping feed_id {} for table feeds_preferences".format(feed_id))
        logger.error(e)


# TODO Test
def insert_feed_properties(cur, feed_id):
    """
    Set feed properties.

    Parameters
    ----------
    cur : object
        Cursor object.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: feed_id: {}'
                .format(function_name, feed_id))
    sql = (
        """
        INSERT
        INTO feeds_properties(
            id)
        VALUES(
            ?)
        """
        )
    par = (feed_id,)
    try:
        cur.execute(sql, par)
    except IntegrityError as e:
        logger.warning(
            "Skipping feed_id {} for table feeds_properties".format(feed_id))
        logger.error(e)


async def insert_feed(db_file, url, title, identifier, entries=None, version=None,
                      encoding=None, language=None, status_code=None,
                      updated=None):
    """
    Insert a new feed into the feeds table.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        URL.
    title : str
        Feed title.
    identifier : str
        Feed identifier.
    entries : int, optional
        Number of entries. The default is None.
    version : str, optional
        Type of feed. The default is None.
    encoding : str, optional
        Encoding of feed. The default is None.
    language : str, optional
        Language code of feed. The default is None.
    status : str, optional
        HTTP status code. The default is None.
    updated : ???, optional
        Date feed was last updated. The default is None.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} url: {}'
                .format(function_name, db_file, url))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO feeds_properties(
                    url, title, identifier, entries, version, encoding, language, updated)
                VALUES(
                    ?, ?, ?, ?, ?, ?, ?, ?)
                """
                )
            par = (url, title, identifier, entries, version, encoding, language, updated)
            cur.execute(sql, par)
            sql = (
                """
                SELECT id
                FROM feeds_properties
                WHERE url = :url
                """
                )
            par = (url,)
            feed_id = cur.execute(sql, par).fetchone()[0]
            sql = (
                """
                INSERT
                INTO feeds_state(
                    feed_id, status_code, valid)
                VALUES(
                    ?, ?, ?)
                """
                )
            par = (feed_id, status_code, 1)
            cur.execute(sql, par)
            sql = (
                """
                INSERT
                INTO feeds_preferences(
                    feed_id)
                VALUES(
                    ?)
                """
                )
            par = (feed_id,)
            cur.execute(sql, par)


async def insert_feed_(db_file, url, title):
    """
    Insert a new feed into the feeds table.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        URL.
    title : str, optional
        Feed title. The default is None.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} url: {}'
                .format(function_name, db_file, url))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO feeds_properties(
                    title, url)
                VALUES(
                    ?, ?)
                """
                )
            par = (
                title, url
                )
            cur.execute(sql, par)
            sql = (
                """
                SELECT id
                FROM feeds_properties
                WHERE url = :url
                """
                )
            par = (url,)
            feed_id = cur.execute(sql, par).fetchone()[0]
            # insert_feed_properties(cur, feed_id)
            insert_feed_status(cur, feed_id)
            insert_feed_preferences(cur, feed_id)


async def remove_feed_by_url(db_file, url):
    """
    Delete a feed by feed URL.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        URL of feed.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} url: {}'
                .format(function_name, db_file, url))
    with create_connection(db_file) as conn:
        async with DBLOCK:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM feeds_properties
                WHERE url = ?
                """
                )
            par = (url,)
            cur.execute(sql, par)


async def remove_feed_by_index(db_file, ix):
    """
    Delete a feed by feed ID.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Index of feed.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        async with DBLOCK:
            cur = conn.cursor()
            # # NOTE Should we move DBLOCK to this line? 2022-12-23
            # sql = (
            #     "DELETE "
            #     "FROM entries "
            #     "WHERE feed_id = ?"
            #     )
            # par = (url,)
            # cur.execute(sql, par) # Error? 2024-01-05
            # sql = (
            #     "DELETE "
            #     "FROM archive "
            #     "WHERE feed_id = ?"
            #     )
            # par = (url,)
            # cur.execute(sql, par)
            sql = (
                """
                DELETE
                FROM feeds_properties
                WHERE id = ?
                """
                )
            par = (ix,)
            cur.execute(sql, par)


def get_feeds_by_tag_id(db_file, tag_id):
    """
    Get feeds of given tag.

    Parameters
    ----------
    db_file : str
        Path to database file.
    tag_id : str
        Tag ID.

    Returns
    -------
    result : tuple
        List of tags.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag_id: {}'
                .format(function_name, db_file, tag_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT feeds_properties.*
            FROM feeds_properties
            INNER JOIN tagged_feeds ON feeds_properties.id = tagged_feeds.feed_id
            INNER JOIN tags ON tags.id = tagged_feeds.tag_id
            WHERE tags.id = ?
            ORDER BY feeds_properties.title;
            """
            )
        par = (tag_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_tags_by_feed_id(db_file, feed_id):
    """
    Get tags of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID.

    Returns
    -------
    result : tuple
        List of tags.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT tags.tag
            FROM tags
            INNER JOIN tagged_feeds ON tags.id = tagged_feeds.tag_id
            INNER JOIN feeds_properties ON feeds_properties.id = tagged_feeds.feed_id
            WHERE feeds_properties.id = ?
            ORDER BY tags.tag;
            """
            )
        par = (feed_id,)
        result = cur.execute(sql, par).fetchall()
        return result


async def set_feed_id_and_tag_id(db_file, feed_id, tag_id):
    """
    Set Feed ID and Tag ID.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID
    tag_id : str
        Tag ID
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} tag_id: {}'
                .format(function_name, db_file, feed_id, tag_id))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO tagged_feeds(
                    feed_id, tag_id)
                VALUES(
                    :feed_id, :tag_id)
                """
                )
            par = {
                "feed_id": feed_id,
                "tag_id": tag_id
                }
            cur.execute(sql, par)


def get_feed_properties(db_file, feed_id):
    """
    Get properties of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID.

    Returns
    -------
    properties : list
        List of properties.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM feeds_properties
            WHERE id = :feed_id
            """
            )
        par = (feed_id,)
        properties = cur.execute(sql, par).fetchone()
    return properties


def get_feed_identifier(db_file, feed_id):
    """
    Get identifier of given feed ID.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID.

    Returns
    -------
    identifier : str
        Identifier name.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT identifier
            FROM feeds_properties
            WHERE id = ?
            """
            )
        par = (feed_id,)
        identifier = cur.execute(sql, par).fetchone()
    return identifier


def check_identifier_exist(db_file, identifier):
    """
    Check whether given identifier exist.

    Parameters
    ----------
    db_file : str
        Path to database file.
    identifier : str
        Identifier name.

    Returns
    -------
    id : str
        ID.
    feed_id : str
        Feed ID.
    identifier : str
        Identifier name.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} identifier: {}'
                .format(function_name, db_file, identifier))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT identifier
            FROM feeds_properties
            WHERE identifier = ?
            """
            )
        par = (identifier,)
        identifier = cur.execute(sql, par).fetchone()
    return identifier


def get_tag_id(db_file, tag_name):
    """
    Get ID of given tag. Check whether tag exist.

    Parameters
    ----------
    db_file : str
        Path to database file.
    tag_name : str
        Tag name.

    Returns
    -------
    ix : str
        Tag ID.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag_name: {}'
                .format(function_name, db_file, tag_name))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id
            FROM tags
            WHERE tag = ?
            """
            )
        par = (tag_name,)
        ix = cur.execute(sql, par).fetchone()
    return ix


def get_tag_name(db_file, ix):
    """
    Get name of given tag. Check whether tag exist.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Tag ID.

    Returns
    -------
    tag_name : str
        Tag name.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT tag
            FROM tags
            WHERE id = ?
            """
            )
        par = (ix,)
        tag_name = cur.execute(sql, par).fetchone()
    return tag_name


def is_tag_id_associated(db_file, tag_id):
    """
    Check whether tag_id is associated with any feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    tag_id : str
        Tag ID.

    Returns
    -------
    tag_id : str
        Tag ID.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag_id: {}'
                .format(function_name, db_file, tag_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT tag_id
            FROM tagged_feeds
            WHERE tag_id = :tag_id
            """
            )
        par = {
            "tag_id": tag_id
            }
        tag_id = cur.execute(sql, par).fetchone()
    return tag_id


async def delete_tag_by_index(db_file, ix):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM tags
                WHERE id = :id
                """
                )
            par = {
                "id": ix
                }
            cur.execute(sql, par)


def is_tag_id_of_feed_id(db_file, tag_id, feed_id):
    """
    Check whether given tag is related with given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID.
    tag_id : str
        Tag ID.

    Returns
    -------
    tag_id : str
        Tag ID.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag_id: {} feed_id: {}'
                .format(function_name, db_file, feed_id, tag_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT tag_id
            FROM tagged_feeds
            WHERE tag_id = :tag_id AND feed_id = :feed_id
            """
            )
        par = {
            "tag_id": tag_id,
            "feed_id": feed_id
            }
        tag_id = cur.execute(sql, par).fetchone()
    return tag_id


async def delete_feed_id_tag_id(db_file, feed_id, tag_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag_id: {} feed_id: {}'
                .format(function_name, db_file, feed_id, tag_id))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM tagged_feeds
                WHERE tag_id = :tag_id AND feed_id = :feed_id
                """
                )
            par = {
                "tag_id": tag_id,
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def set_new_tag(db_file, tag):
    """
    Set new Tag

    Parameters
    ----------
    db_file : str
        Path to database file.
    tag : str
        Tag
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} tag: {}'
                .format(function_name, db_file, tag))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO tags(
                    tag)
                VALUES(
                    :tag)
                """
                )
            par = {
                "tag": tag
                }
            cur.execute(sql, par)


def get_feed_id_and_name(db_file, url):
    """
    Get Id and Name of feed.
    Check whether a feed exists.
    Query for feeds by given url.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        URL.

    Returns
    -------
    result : tuple
        List of ID and Name of feed.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} url: {}'
                .format(function_name, db_file, url))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id, title
            FROM feeds_properties
            WHERE url = ?
            """
            )
        par = (url,)
        result = cur.execute(sql, par).fetchone()
        return result


def get_number_of_items(db_file, table):
    """
    Return number of entries or feeds.

    Parameters
    ----------
    db_file : str
        Path to database file.
    table : str
        "entries_properties" or "feeds_properties".

    Returns
    -------
    count : ?
        Number of rows.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} table: {}'
                .format(function_name, db_file, table))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT count(id)
            FROM {}
            """
            ).format(table)
        count = cur.execute(sql).fetchone()[0]
        return count


def get_number_of_feeds_active(db_file):
    """
    Return number of active feeds.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    count : str
        Number of rows.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT count(id)
            FROM feeds_preferences
            WHERE enabled = 1
            """
            )
        count = cur.execute(sql).fetchone()[0]
        return count


def get_number_of_entries_unread(db_file):
    """
    Return number of unread items.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    count : ?
        Number of rows.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT count(id)
            FROM entries_state
            WHERE read = 0
            """
            )
        count = cur.execute(sql).fetchone()[0]
        return count


def get_entries(db_file, num):
    """
    Extract information from entries.

    Parameters
    ----------
    db_file : str
        Path to database file.
    num : str, optional
        Number. The default is None.

    Returns
    -------
    result : tuple
        News items.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} num: {}'
                .format(function_name, db_file, num))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id, title, link, summary_text, feed_id, published
            FROM entries_properties
            ORDER BY published DESC
            LIMIT :num
            """
            )
        par = (num,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_entries_rejected(db_file, num):
    """
    Extract information from rejected entries.

    Parameters
    ----------
    db_file : str
        Path to database file.
    num : str, optional
        Number. The default is None.

    Returns
    -------
    result : tuple
        News items.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} num: {}'
                .format(function_name, db_file, num))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT entries_properties.id, title, link, summary_text, feed_id, published
            FROM entries_properties
            INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
            WHERE entries_state.rejected = 1
            ORDER BY published DESC
            LIMIT :num
            """
            )
        par = (num,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_enclosure_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT url
            FROM entries_properties_links
            WHERE entry_id = :entry_id AND rel = "enclosure"
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchone()
        return result


def get_unread_entries(db_file, num):
    """
    Extract information from unread entries.

    Parameters
    ----------
    db_file : str
        Path to database file.
    num : str, optional
        Number. The default is None.

    Returns
    -------
    result : tuple
        News items.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} num: {}'
                .format(function_name, db_file, num))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT entries_properties.id, title, link, summary_text, feed_id, published
            FROM entries_properties
            INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
            WHERE entries_state.read = 0
            ORDER BY published DESC
            LIMIT :num
            """
            )
        par = (num,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_feed_id_by_entry_index(db_file, ix):
    """
    Get feed id by entry index.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Index.

    Returns
    -------
    feed_id : str
        Feed index.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT feed_id
            FROM entries_properties
            WHERE id = :ix
            """
            )
        par = (ix,)
        feed_id = cur.execute(sql, par).fetchone()
        return feed_id


def get_feed_id(db_file, url):
    """
    Get index of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        URL.

    Returns
    -------
    feed_id : str
        Feed index.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} url: {}'
                .format(function_name, db_file, url))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id
            FROM feeds_properties
            WHERE url = :url
            """
            )
        par = (url,)
        feed_id = cur.execute(sql, par).fetchone()
        return feed_id


def is_entry_archived(cur, ix):
    """
    Check whether a given entry is archived.

    Parameters
    ----------
    cur : object
        Cursor object.
    ix : str
        Index of entry.

    Returns
    -------
    result : tuple
        Entry ID.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: ix: {}'
                .format(function_name, ix))
    sql = (
        """
        SELECT id
        FROM entries_state
        WHERE archived = 1 AND entry_id = ?
        """
        )
    par = (ix,)
    result = cur.execute(sql, par).fetchone()
    return result

async def mark_entry_as_read(cur, ix):
    """
    Set read status of entry as read.

    Parameters
    ----------
    cur : object
        Cursor object.
    ix : str
        Index of entry.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: ix: {}'
                .format(function_name, ix))
    sql = (
        """
        UPDATE entries_state
        SET read = 1
        WHERE entry_id = ?
        """
        )
    par = (ix,)
    cur.execute(sql, par)


def get_status_information_of_feed(db_file, feed_id):
    """
    Get status information of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM feeds_state
            WHERE feed_id = ?
            """
            )
        par = (feed_id,)
        count = cur.execute(sql, par).fetchone()
        return count


def get_unread_entries_of_feed(db_file, feed_id):
    """
    Get entries of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties
            INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
            WHERE entries_state.read = 0 AND feed_id = ?
            """
            )
        par = (feed_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_number_of_unread_entries_by_feed(db_file, feed_id):
    """
    Count entries of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT count(entries_properties.id)
            FROM entries_properties
            INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
            WHERE entries_state.read = 0 AND feed_id = ?
            """
            )
        par = (feed_id,)
        count = cur.execute(sql, par).fetchone()
        return count


async def mark_feed_as_read(db_file, feed_id):
    """
    Set read status of entries of given feed as read.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed ID.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                SELECT id
                FROM entries_properties
                WHERE feed_id = ?
                """
                )
            par = (feed_id,)
            ixs = cur.execute(sql, par).fetchall()
            sql = (
                """
                UPDATE entries_state
                SET read = 1
                WHERE entry_id = ?
                """
                )
            for ix in ixs: cur.execute(sql, ix)
            # for ix in ixs:
            #     par = ix # Variable ix is already of type tuple
            #     cur.execute(sql, par)


async def delete_entry_by_id(db_file, ix):
    """
    Delete entry by Id.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Index.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM entries_properties
                WHERE id = :ix
                """
                )
            par = (ix,)
            cur.execute(sql, par)


async def archive_entry(db_file, ix):
    """
    Insert entry to archive and delete entry.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Index.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE entries_state
                SET archived = 1
                WHERE entry_id = :ix
                """
                )
            par = (ix,)
            cur.execute(sql, par)


def get_feed_title(db_file, feed_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title
            FROM feeds_properties
            WHERE id = :feed_id
            """
            )
        par = (feed_id,)
        title = cur.execute(sql, par).fetchone()
        return title


def get_feed_subtitle(db_file, feed_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT subtitle
            FROM feeds_properties
            WHERE id = :feed_id
            """
            )
        par = (feed_id,)
        title = cur.execute(sql, par).fetchone()
        return title


async def set_feed_title(db_file, feed_id, title):
    """
    Set new name for feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Index of feed.
    name : str
        New name.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} title: {}'
                .format(function_name, db_file, feed_id, title))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_properties
                SET title = :title
                WHERE id = :feed_id
                """
                )
            par = {
                "title": title,
                "feed_id": feed_id
                }
            cur.execute(sql, par)


def get_entry_properties(db_file, ix):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties
            WHERE id = :ix
            """
            )
        par = (ix,)
        title = cur.execute(sql, par).fetchone()
        return title


def get_entry_title(db_file, ix):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title
            FROM entries_properties
            WHERE id = :ix
            """
            )
        par = (ix,)
        title = cur.execute(sql, par).fetchone()
        return title


def get_entry_url(db_file, ix):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                .format(function_name, db_file, ix))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT link
            FROM entries_properties
            WHERE id = :ix
            """
            )
        par = (ix,)
        url = cur.execute(sql, par).fetchone()
        return url


def get_feed_url(db_file, feed_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT url
            FROM feeds_properties
            WHERE id = :feed_id
            """
            )
        par = (feed_id,)
        url = cur.execute(sql, par).fetchone()
        return url


async def mark_as_read(db_file, ix):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} ix: {}'
                 .format(function_name, db_file, ix))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            # TODO While `async with DBLOCK` does work well from
            # outside of functions, it would be better practice
            # to place it within the functions.
            # NOTE: We can use DBLOCK once for both
            # functions, because, due to exclusive
            # ID, only one can ever occur.
            if is_entry_archived(cur, ix):
                await delete_entry(cur, ix)
            else:
                await mark_entry_as_read(cur, ix)
            


async def mark_all_as_read(db_file):
    """
    Set read status of all entries as read.

    Parameters
    ----------
    db_file : str
        Path to database file.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                 .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE entries_state
                SET read = 1
                """
                )
            cur.execute(sql)
            
            sql = (
                """
                SELECT entries_properties.id, title, link, summary_text, feed_id, published
                FROM entries_properties
                INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
                WHERE entries_state.archived = 1
                """
                )
            ixs = cur.execute(sql).fetchall()
            sql = (
                """
                DELETE
                FROM entries_properties
                WHERE id = ?
                """
                )
            for ix in ixs: cur.execute(sql, ix)


async def delete_entry(cur, ix):
    """
    Delete entry.

    Parameters
    ----------
    db_file : str
        Path to database file.
    ix : str
        Index of entry.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: ix: {}'
                .format(function_name, ix))
    sql = (
        """
        DELETE
        FROM entries_properties
        WHERE id = ?
        """
        )
    par = (ix,)
    cur.execute(sql, par)


async def update_statistics(cur):
    """
    Update table statistics.

    Parameters
    ----------
    cur : object
        Cursor object.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}'.format(function_name))
    stat_dict = {}
    stat_dict["feeds"] = get_number_of_items(cur, 'feeds_properties')
    stat_dict["entries"] = get_number_of_items(cur, 'entries_properties')
    stat_dict["unread"] = get_number_of_entries_unread(cur=cur)
    for i in stat_dict:
        sql = (
            "SELECT id "
            "FROM statistics "
            "WHERE title = ?"
            )
        par = (i,)
        cur.execute(sql, par)
        if cur.fetchone():
            sql = (
                "UPDATE statistics "
                "SET number = :num "
                "WHERE title = :title"
                )
            par = {
                "title": i,
                "num": stat_dict[i]
                }
            cur.execute(sql, par)
        else:
            sql = (
                "SELECT count(id) "
                "FROM statistics"
                )
            count = cur.execute(sql).fetchone()[0]
            ix = count + 1
            sql = (
                "INSERT INTO statistics "
                "VALUES(?,?,?)"
                )
            par = (ix, i, stat_dict[i])
            cur.execute(sql, par)


async def set_enabled_status(db_file, feed_id, status):
    """
    Set status of feed to enabled or not enabled (i.e. disabled).

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Index of feed.
    status : int
        0 or 1.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} status: {}'
                .format(function_name, db_file, feed_id, status))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_preferences
                SET enabled = :status
                WHERE feed_id = :feed_id
                """
                )
            par = {
                "status": status,
                "feed_id": feed_id
                }
            cur.execute(sql, par)


"""
TODO

Investigate what causes date to be int 0

NOTE

When time functions of slixfeed.timedate
were async, there were errors of coroutines

"""
async def add_entry(db_file, title, link, entry_id, feed_id, date,
                    read_status):
    """
    Add a new entry row into the entries table.

    Parameters
    ----------
    db_file : str
        Path to database file.
    title : str
        Title.
    link : str
        Link.
    entry_id : str
        Entry index.
    feed_id : str
        Feed Id.
    date : str
        Date.
    read_status : str
        0 or 1.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} title: {} link: {} entry_id: {} feed_id: {} date: {} read_status: {}'
                .format(function_name, db_file, title, link, entry_id, feed_id, date, read_status))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO entries(
                    title, link, entry_id, feed_id, published, read)
                VALUES(
                    :title, :link, :entry_id, :feed_id, :published, :read)
                """
                )
            par = {
                "title": title,
                "link": link,
                "entry_id": entry_id,
                "feed_id": feed_id,
                "published": date,
                "read": read_status
                }
            cur.execute(sql, par)
            # try:
            #     cur.execute(sql, entry)
            # except:
            #     # None
            #     print("Unknown error for sqlite.add_entry")
            #     print(entry)
            #     #
            #     # print(current_time(), "COROUTINE OBJECT NOW")
            #     # for i in entry:
            #     #     print(type(i))
            #     #     print(i)
            #     # print(type(entry))
            #     # print(entry)
            #     # print(current_time(), "COROUTINE OBJECT NOW")
            #     # breakpoint()


async def add_entries_and_update_feed_state(db_file, feed_id, new_entries):
    """
    Add new entries and update feed state.

    Parameters
    ----------
    db_file : str
        Path to database file.
    new_entries : tuple
        Set of entries as dict.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            for new_entry in new_entries:
                logger.debug('{}: db_file: {} feed_id: {}'
                            .format(function_name, db_file, feed_id))
                sql = (
                    """
                    INSERT
                    INTO entries_properties(
                        feed_id, identifier, link, title, title_type, summary_text, summary_lang, summary_type, summary_base, category, comments, published, updated)
                    VALUES(
                        :feed_id, :identifier, :link, :title, :title_type, :summary_text, :summary_lang, :summary_type, :summary_base, :category, :comments, :published, :updated)
                    """
                    )
                entry_properties = new_entry['entry_properties']
                par = {
                    "feed_id": feed_id,
                    "identifier": entry_properties["identifier"],
                    "link": entry_properties["link"],
                    "title": entry_properties["title"],
                    "title_type": entry_properties["title_type"],
                    'summary_text' : entry_properties['summary_text'],
                    'summary_lang' : entry_properties['summary_lang'],
                    'summary_type' : entry_properties['summary_type'],
                    'summary_base' : entry_properties['summary_base'],
                    'category' : entry_properties['category'],
                    "comments": entry_properties["comments"],
                    "published": entry_properties["published"],
                    "updated": entry_properties["updated"],
                    }
                cur.execute(sql, par)
                entry_id = cur.lastrowid
                sql = (
                    """
                    INSERT
                    INTO entries_state(
                        entry_id)
                    VALUES(
                        :entry_id)
                    """
                    )
                par = {
                    "entry_id": entry_id,
                    }
                cur.execute(sql, par)
                entry_authors = new_entry['entry_authors']
                for entry_author in entry_authors:
                    sql = (
                        """
                        INSERT
                        INTO entries_properties_authors(
                            entry_id, name, url, email)
                        VALUES(
                            :entry_id, :name, :url, :email)
                        """
                        )
                    par = {
                        "entry_id": entry_id,
                        "name": entry_author['name'],
                        "url": entry_author['url'],
                        "email": entry_author['email'],
                        }
                    cur.execute(sql, par)
                entry_contributors = new_entry['entry_contributors']
                for entry_contributor in entry_contributors:
                    sql = (
                        """
                        INSERT
                        INTO entries_properties_contributors(
                            entry_id, name, url, email)
                        VALUES(
                            :entry_id, :name, :url, :email)
                        """
                        )
                    par = {
                        "entry_id": entry_id,
                        "name": entry_contributor['name'],
                        "url": entry_contributor['url'],
                        "email": entry_contributor['email'],
                        }
                    cur.execute(sql, par)
                entry_contents = new_entry['entry_contents']
                for entry_content in entry_contents:
                    sql = (
                        """
                        INSERT
                        INTO entries_properties_contents(
                            entry_id, text, type, base, lang)
                        VALUES(
                            :entry_id, :text, :type, :base, :lang)
                        """
                        )
                    par = {
                        "entry_id": entry_id,
                        "text": entry_content['text'],
                        "type": entry_content['type'],
                        "base": entry_content['base'],
                        "lang": entry_content['lang'],
                        }
                    cur.execute(sql, par)
                entry_links = new_entry['entry_tags']
                for entry_link in entry_links:
                    sql = (
                        """
                        INSERT
                        INTO entries_properties_tags(
                            entry_id, term, scheme, label)
                        VALUES(
                            :entry_id, :term, :scheme, :label)
                        """
                        )
                    par = {
                        "entry_id": entry_id,
                        "term": entry_link['term'],
                        "scheme": entry_link['scheme'],
                        "label": entry_link['label'],
                        }
                    cur.execute(sql, par)
                entry_links = new_entry['entry_links']
                for entry_link in entry_links:
                    sql = (
                        """
                        INSERT
                        INTO entries_properties_links(
                            entry_id, url, type, rel, size)
                        VALUES(
                            :entry_id, :url, :type, :rel, :size)
                        """
                        )
                    par = {
                        "entry_id": entry_id,
                        "url": entry_link['url'],
                        "rel": entry_link['rel'],
                        "type": entry_link['type'],
                        "size": entry_link['length'],
                        }
                    cur.execute(sql, par)
            sql = (
                """
                UPDATE feeds_state
                SET renewed = :renewed
                WHERE feed_id = :feed_id
                """
                )
            par = {
                "renewed": time.time(),
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def set_date(db_file, feed_id):
    """
    Set renewed date of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_state
                SET renewed = :renewed
                WHERE feed_id = :feed_id
                """
                )
            par = {
                "renewed": time.time(),
                "feed_id": feed_id
                }
            # cur = conn.cursor()
            cur.execute(sql, par)


async def update_feed_identifier(db_file, feed_id, identifier):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} identifier: {}'
                .format(function_name, db_file, feed_id, identifier))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_properties
                SET identifier = :identifier
                WHERE id = :feed_id
                """
                )
            par = {
                "identifier": identifier,
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def update_feed_status(db_file, feed_id, status_code):
    """
    Set status_code of feed_id in table status.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        Feed URL.
    status : str
        Status ID or message.
    """
    # print('MID', feed_id, 'update_feed_status')
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} status_code: {}'
                .format(function_name, db_file, feed_id, status_code))
    if status_code != 200:
        print('{}: db_file: {} feed_id: {} status_code: {}'
                    .format(function_name, db_file, feed_id, status_code))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_state
                SET status_code = :status_code, scanned = :scanned
                WHERE feed_id = :feed_id
                """
                )
            par = {
                "status_code": status_code,
                "scanned": time.time(),
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def update_feed_validity(db_file, feed_id, valid):
    """
    Set validity status of feed_id in table status.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        Feed URL.
    valid : boolean
        0 or 1.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} valid: {}'
                .format(function_name, db_file, feed_id, valid))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_state
                SET valid = :valid
                WHERE feed_id = :feed_id
                """
                )
            par = {
                "valid": valid,
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def update_feed_properties(db_file, feed_id, feed_properties):
    """
    Update properties of url in table feeds.

    Parameters
    ----------
    db_file : str
        Path to database file.
    url : str
        Feed URL.
    feed_properties : dict
        Feed properties.
    """
    # print('MID', feed_id, 'update_feed_properties')
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {} feed_properties: {}'
                .format(function_name, db_file, feed_id, feed_properties))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE feeds_properties
                SET version = :version, encoding = :encoding,
                    language = :language, rating = :rating,
                    entries = :entries, icon = :icon, image = :image,
                    logo = :logo, ttl = :ttl, updated = :updated
                WHERE id = :feed_id
                """
                )
            par = {
                "version" : feed_properties['version'],
                "encoding" : feed_properties['encoding'],
                "language" : feed_properties['language'],
                "rating" : feed_properties['rating'],
                "entries" : feed_properties['entries_count'],
                "icon" : feed_properties['icon'],
                "image" : feed_properties['image'],
                "logo" : feed_properties['logo'],
                "ttl" : feed_properties['ttl'],
                "updated" : feed_properties['updated'],
                "feed_id": feed_id
                }
            cur.execute(sql, par)


async def maintain_archive(db_file, limit):
    """
    Maintain list of archived entries equal to specified number of items.

    Parameters
    ----------
    db_file : str
        Path to database file.
    limit : str
        Number of maximum entries to store.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} limit: {}'
                .format(function_name, db_file, limit))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                SELECT count(id)
                FROM entries_state
                WHERE archived = 1
                """
                )
            count = cur.execute(sql).fetchone()[0]
            # FIXME Upon first time joining to a groupchat
            # and then adding a URL, variable "limit"
            # becomes a string in one of the iterations.
            # if isinstance(limit,str):
            #     print("STOP")
            #     breakpoint()
            difference = count - int(limit)
            if difference > 0:
                sql = (
                    """
                    DELETE
                    FROM entries_properties
                    WHERE id
                    IN (
                        SELECT entry_id
                        FROM entries_state
                        INNER JOIN entries_properties ON entries_state.entry_id = entries_properties.id
                        WHERE archived = 1
                        ORDER BY published ASC
                        LIMIT :difference
                        )
                    """
                    )
                par = {
                    "difference": difference
                    }
                cur.execute(sql, par)


def get_authors_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{} db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties_authors
            WHERE entry_id = :entry_id
            ORDER BY name DESC
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_contributors_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{} db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties_contributors
            WHERE entry_id = :entry_id
            ORDER BY name DESC
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_links_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties_links
            WHERE entry_id = :entry_id
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_tags_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties_tags
            WHERE entry_id = :entry_id
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_contents_by_entry_id(db_file, entry_id):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} entry_id: {}'
                .format(function_name, db_file, entry_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT *
            FROM entries_properties_contents
            WHERE entry_id = :entry_id
            """
            )
        par = (entry_id,)
        result = cur.execute(sql, par).fetchall()
        return result


# TODO Move entries that don't exist into table archive.
# NOTE Entries that are read from archive are deleted.
# NOTE Unlike entries from table entries, entries from
#      table archive are not marked as read.
def get_entries_of_feed(db_file, feed_id):
    """
    Get entries of given feed.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{} db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id, title, link, identifier, published
            FROM entries_properties
            WHERE feed_id = ?
            ORDER BY published DESC
            """
            )
        par = (feed_id,)
        items = cur.execute(sql, par).fetchall()
        return items


# TODO What is this function for? 2024-01-02
# def get_feeds(db_file):
#     """
#     Query table feeds for Title, URL, Categories, Tags.

#     Parameters
#     ----------
#     db_file : str
#         Path to database file.

#     Returns
#     -------
#     result : tuple
#         Title, URL, Categories, Tags of feeds.
#     """
#     with create_connection(db_file) as conn:
#         cur = conn.cursor()
#         sql = (
#             "SELECT name, address, type, categories, tags "
#             "FROM feeds"
#             )
#         result = cur.execute(sql).fetchall()
#         return result

# TODO select by "feed_id" (of table "status") from
# "feed" urls that are enabled in table "status"
def get_feeds_url(db_file):
    """
    Query table feeds for URLs.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    result : tuple
        URLs of active feeds.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{} db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT url
            FROM feeds_properties
            """
            )
        result = cur.execute(sql).fetchall()
        return result


def get_feeds_by_enabled_state(db_file, enabled_state):
    """
    Query table feeds by enabled state.

    Parameters
    ----------
    db_file : str
        Path to database file.
    enabled_state : boolean
        False or True.

    Returns
    -------
    result : tuple
        List of URLs.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} enabled_state: {}'
                .format(function_name, db_file, enabled_state))
    if enabled_state:
        enabled_state = 1
    else:
        enabled_state = 0
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT feeds_properties.*
            FROM feeds_properties
            INNER JOIN feeds_preferences ON feeds_properties.id = feeds_preferences.feed_id
            WHERE feeds_preferences.enabled = ?
            """
            )
        par = (enabled_state,)
        result = cur.execute(sql, par).fetchall()
        return result


def get_feeds_and_enabled_state(db_file):
    """
    Select table feeds and join column enabled.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    result : tuple
        List of URLs.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT feeds_properties.*, feeds_preferences.enabled
            FROM feeds_properties
            INNER JOIN feeds_preferences ON feeds_properties.id = feeds_preferences.feed_id
            ORDER BY feeds_properties.title ASC
            """
            )
        result = cur.execute(sql).fetchall()
        return result


def get_active_feeds_url(db_file):
    """
    Query table feeds for active URLs.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    result : tuple
        URLs of active feeds.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT feeds_properties.url
            FROM feeds_properties
            INNER JOIN feeds_preferences ON feeds_properties.id = feeds_preferences.feed_id
            WHERE feeds_preferences.enabled = 1
            """
            )
        result = cur.execute(sql).fetchall()
        return result


def get_tags(db_file):
    """
    Query table tags and list items.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    result : tuple
        List of tags.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT tag, id
            FROM tags
            ORDER BY tag
            """
            )
        result = cur.execute(sql).fetchall()
        return result


def get_feeds(db_file):
    """
    Query table feeds and list items.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    result : tuple
        URLs of feeds.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    # TODO
    # 1) Select id from table feeds
    #    Select name, url (feeds) updated, enabled, feed_id (status)
    # 2) Sort feeds by id. Sort status by feed_id
    # result += cur.execute(sql).fetchall()
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT id, title, url
            FROM feeds_properties
            ORDER BY title
            """
            )
        result = cur.execute(sql).fetchall()
        return result


def get_last_entries(db_file, num):
    """
    Query entries.

    Parameters
    ----------
    db_file : str
        Path to database file.
    num : str
        Number.

    Returns
    -------
    titles_list : tuple
        List of recent N entries as message.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} num: {}'
                .format(function_name, db_file, num))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        # sql = (
        #     "SELECT title, link "
        #     "FROM entries "
        #     "ORDER BY ROWID DESC "
        #     "LIMIT :num"
        #     )
        sql = (
            """
            SELECT title, link, published
            FROM entries_properties
            INNER JOIN entries_state ON entries_properties.id = entries_state.entry_id
            WHERE entries_state.read = 0
            ORDER BY published DESC
            LIMIT :num
            """
            )
        par = (num,)
        result = cur.execute(sql, par).fetchall()
        return result


def search_feeds(db_file, query):
    """
    Query feeds.

    Parameters
    ----------
    db_file : str
        Path to database file.
    query : str
        Search query.

    Returns
    -------
    result : tuple
        Feeds of specified keywords as message.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} query: {}'
                .format(function_name, db_file, query))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title, id, url
            FROM feeds_properties
            WHERE title LIKE ?
            OR url LIKE ?
            LIMIT 50
            """
            )
        par = [f'%{query}%', f'%{query}%']
        result = cur.execute(sql, par).fetchall()
        return result


async def search_entries(db_file, query):
    """
    Query entries.

    Parameters
    ----------
    db_file : str
        Path to database file.
    query : str
        Search query.

    Returns
    -------
    titles_list : tuple
        Entries of specified keywords as message.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} query: {}'
                .format(function_name, db_file, query))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title, link
            FROM entries_properties
            WHERE title LIKE ?
            LIMIT 50
            """
            )
        par = (f'%{query}%', f'%{query}%')
        result = cur.execute(sql, par).fetchall()
        return result


"""
FIXME

Error due to missing date, but it appears that date is present:
ERROR DATE: source = https://blog.heckel.io/feed/
ERROR DATE: date = 2008-05-13T13:51:50+00:00
ERROR DATE: result = https://blog.heckel.io/feed/

19:32:05 ERROR DATE: source = https://mwl.io/feed
19:32:05 ERROR DATE: date = 2023-11-30T10:56:39+00:00
19:32:05 ERROR DATE: result = https://mwl.io/feed
19:32:05 ERROR DATE: source = https://mwl.io/feed
19:32:05 ERROR DATE: date = 2023-11-22T16:59:08+00:00
19:32:05 ERROR DATE: result = https://mwl.io/feed
19:32:06 ERROR DATE: source = https://mwl.io/feed
19:32:06 ERROR DATE: date = 2023-11-16T10:33:57+00:00
19:32:06 ERROR DATE: result = https://mwl.io/feed
19:32:06 ERROR DATE: source = https://mwl.io/feed
19:32:06 ERROR DATE: date = 2023-11-09T07:37:57+00:00
19:32:06 ERROR DATE: result = https://mwl.io/feed

"""
def check_entry_exist(db_file, feed_id, identifier=None, title=None, link=None,
                      published=None):
    """
    Check whether an entry exists.
    If entry has an ID, check by ID.
    If entry has timestamp (published), check by title, link and date.
    Otherwise, check by title and link.

    Parameters
    ----------
    db_file : str
        Path to database file.
    feed_id : str
        Feed Id.
    identifier : str, optional
        Entry ID. The default is None.
    title : str, optional
        Entry title. The default is None.
    link : str, optional
        Entry URL. The default is None.
    published : str, optional
        Entry Timestamp. The default is None.

    Returns
    -------
    bool
        True or None.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} feed_id: {}'
                .format(function_name, db_file, feed_id))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        exist = False
        if identifier:
            sql = (
                """
                SELECT id
                FROM entries_properties
                WHERE identifier = :identifier and feed_id = :feed_id
                """
                )
            par = {
                "identifier": identifier,
                "feed_id": feed_id
                }
            result = cur.execute(sql, par).fetchone()
            if result: exist = True
        elif published:
            sql = (
                """
                SELECT id
                FROM entries_properties
                WHERE title = :title AND link = :link AND published = :date
                """
                )
            par = {
                "title": title,
                "link": link,
                "date": published
                }
            try:
                result = cur.execute(sql, par).fetchone()
                if result: exist = True
            except:
                logger.error("source =" + feed_id)
                logger.error("published =" + published)
        else:
            sql = (
                """
                SELECT id
                FROM entries_properties
                WHERE title = :title AND link = :link
                """
                )
            par = {
                "title": title,
                "link": link
                }
            result = cur.execute(sql, par).fetchone()
            if result: exist = True
        # try:
        #     if result:
        #         return True
        #     else:
        #         return None
        # except:
        #     print(current_time(), "ERROR DATE: result =", url)
        return exist


async def set_setting_value(db_file, key_value):
    """
    Set setting value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key_value : list
         key : str
               enabled, interval, masters, quantum, random.
         value : int
               Numeric value.
    """
    key = key_value[0]
    val = key_value[1]

    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {} val: {}'
                .format(function_name, db_file, key, val))

    # NOTE This is not a good practice!
    # When INI file was used, all values were strings.
    # When TOML is now used, integers are integers, which means that
    # statement "if not val" is equivalent to "if not 0" which is not so to
    # statement "if not '0'"

    # if not val:
    #     raise Exception('Missing value for key "{}" ({}).'.format(key, db_file))
        # logger.error('Missing value for key "{}" ({}).'.format(key, db_file))
        # return

    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO settings(
                    key, value)
                VALUES(
                    :key, :val)
                """
                )
            par = {
                "key": key,
                "val": val
                }
            cur.execute(sql, par)


async def update_setting_value(db_file, key_value):
    """
    Update setting value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key_value : list
         key : str
               enabled, interval, masters, quantum, random.
         value : int
               Numeric value.
    """
    # if isinstance(key_value, list):
    #     key = key_value[0]
    #     val = key_value[1]
    # elif key_value == "enable":
    #     key = "enabled"
    #     val = 1
    # else:
    #     key = "enabled"
    #     val = 0
    key = key_value[0]
    val = key_value[1]

    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {} val: {}'
                .format(function_name, db_file, key, val))

    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE settings
                SET value = :val
                WHERE key = :key
                """
                )
            par = {
                "key": key,
                "val": val
                }
            cur.execute(sql, par)
            # except:
            #     logging.debug(
            #         "No specific value set for key {}.".format(key)
            #         )


async def delete_filter(db_file, key):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM filters
                WHERE key = ?
                """
                )
            par = (key,)
            cur.execute(sql, par)


async def delete_setting(db_file, key):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM settings
                WHERE key = ?
                """
                )
            par = (key,)
            cur.execute(sql, par)


async def delete_settings(db_file):
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                DELETE
                FROM settings
                """
                )
            cur.execute(sql)


def get_setting_value(db_file, key):
    """
    Get settings value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key : str
        Key: archive, enabled, filter-allow, filter-deny,
             interval, length, old, quantum, random.

    Returns
    -------
    val : str
        Numeric value.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT value
            FROM settings
            WHERE key = ?
            """
            )
        par = (key,)
        value = cur.execute(sql, par).fetchone()
        return value


def is_setting_key(db_file, key):
    """
    Check whether setting key exist.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key : str
        Key: allow, deny.

    Returns
    -------
    key : str
        Key.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT key
            FROM settings
            WHERE key = ?
            """
            )
        par = (key,)
        key = cur.execute(sql, par).fetchone()
    return key


async def set_filter_value(db_file, key_value):
    """
    Set settings value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key_value : list
         key : str
               allow, deny, replace.
         value : int
               Numeric value.
    """
    key = key_value[0]
    val = key_value[1]

    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {} val: {}'
                .format(function_name, db_file, key, val))

    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO filters(
                    key, value)
                VALUES(
                    :key, :val)
                """
                )
            par = {
                "key": key,
                "val": val
                }
            cur.execute(sql, par)


async def update_filter_value(db_file, key_value):
    """
    Update settings value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key_value : list
         key : str
               allow, deny, replace.
         value : int
               Numeric value.
    """
    # if isinstance(key_value, list):
    #     key = key_value[0]
    #     val = key_value[1]
    # elif key_value == "enable":
    #     key = "enabled"
    #     val = 1
    # else:
    #     key = "enabled"
    #     val = 0
    key = key_value[0]
    val = key_value[1]

    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {} val: {}'
                .format(function_name, db_file, key, val))

    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE filters
                SET value = :value
                WHERE key = :key
                """
                )
            par = {
                "key": key,
                "value": val
                }
            cur.execute(sql, par)


def is_filter_key(db_file, key):
    """
    Check whether filter key exist.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key : str
        Key: allow, deny.

    Returns
    -------
    key : str
        Key.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT key
            FROM filters
            WHERE key = ?
            """
            )
        par = (key,)
        key = cur.execute(sql, par).fetchone()
        return key


def get_filter_value(db_file, key):
    """
    Get filter value.

    Parameters
    ----------
    db_file : str
        Path to database file.
    key : str
        Key: allow, deny.

    Returns
    -------
    value : str
        List of strings.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} key: {}'
                .format(function_name, db_file, key))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT value
            FROM filters
            WHERE key = ?
            """
            )
        par = (key,)
        value = cur.execute(sql, par).fetchone()
    return value


async def set_last_update_time(db_file):
    """
    Set value of last_update.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    None.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                INSERT
                INTO status(
                    key, value)
                VALUES(
                    :key, :value)
                """
                )
            par = {
                "key": "last_update",
                "value": time.time()
                }
            cur.execute(sql, par)


def get_last_update_time(db_file):
    """
    Get value of last_update.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    val : str
        Time.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        try:
            sql = (
                """
                SELECT value
                FROM status
                WHERE key = "last_update"
                """
                )
            value = cur.execute(sql).fetchone()[0]
            value = str(value)
        except:
            value = None
            logger.debug(
                "No specific value set for key last_update.")
    return value


async def update_last_update_time(db_file):
    """
    Update value of last_update.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    None.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    async with DBLOCK:
        with create_connection(db_file) as conn:
            cur = conn.cursor()
            sql = (
                """
                UPDATE status
                SET value = :value
                WHERE key = "last_update"
                """
                )
            par = {
                "value": time.time()
                }
            cur.execute(sql, par)

########################################

######### EXPERIMENTAL TABLE ###########

########################################

def get_categories(db_file):
    """
    Get list of categories.

    Parameters
    ----------
    db_file : tuple
        Path to database file.

    Returns
    -------
    categories : str
        List of categories.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT DISTINCT category
            FROM entries
            ORDER BY category ASC
            """
            )
        categories = cur.execute(sql).fetchall()
    return categories


def get_locales(db_file):
    """
    Get list of locales.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    locales : tuple
        List of locales.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT DISTINCT locale
            FROM entries
            ORDER BY locale ASC
            """
            )
        locales = cur.execute(sql).fetchall()
    return locales


def get_nations(db_file):
    """
    Get list of nations.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    nations : tuple
        List of nations.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT DISTINCT nation
            FROM entries
            ORDER BY nation ASC
            """
            )
        locales = cur.execute(sql).fetchall()
    return locales


# def get_tags(db_file):
#     """
#     Get list of title and urls.

#     Parameters
#     ----------
#     db_file : str
#         Path to database file.

#     Returns
#     -------
#     titles_urls : tuple
#         List of titles and urls.
#     """
#     with create_connection(db_file) as conn:
#         cur = conn.cursor()
#         sql = (
#             """
#             SELECT tags
#             FROM entries
#             ORDER BY tags ASC
#             """
#             )
#         titles_urls = cur.execute(sql).fetchall()
#     return titles_urls


def get_titles_tags_urls(db_file):
    """
    Get list of title and urls.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    titles_urls : tuple
        List of titles and urls.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {}'
                .format(function_name, db_file))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title, tags, url
            FROM entries
            ORDER BY title ASC
            LIMIT 800
            """
            )
        titles_tags_urls = cur.execute(sql).fetchall()
    return titles_tags_urls


def get_titles_tags_urls_by_category(db_file, category):
    """
    Get list of title and urls of given category.

    Parameters
    ----------
    db_file : str
        Path to database file.

    Returns
    -------
    titles_urls : tuple
        List of titles and urls.
    """
    function_name = sys._getframe().f_code.co_name
    logger.debug('{}: db_file: {} category: {}'
                .format(function_name, db_file, category))
    with create_connection(db_file) as conn:
        cur = conn.cursor()
        sql = (
            """
            SELECT title, tags, url
            FROM entries
            WHERE category = :category
            ORDER BY title ASC
            """
            )
        par = {
            "category": category
            }
        titles_tags_urls = cur.execute(sql, par).fetchall()
    return titles_tags_urls