--
-- feedWatcher_schema.sql - version 0.0.10
--
-- Renamed 'feedWatcher.sql' => `feedWatcher_schema.sql' on 2021-08-31
--

/*
 * Table 'urls'
 * ------------
 *
 * The main table containing host, http and feed information
 */

DROP TABLE IF EXISTS urls;

CREATE TABLE urls (
    id                  integer PRIMARY KEY,
    url                 varchar(1024) NOT NULL,
    dns                 text,
    host_up             boolean DEFAULT 0,
    http_status         varchar(80),
    content_type        varchar(40),
    urltype             varchar(40),
    feedformat          varchar(20),
    title               varchar(1024),
    description         text,
    author              varchar(80),
    modified            timestamp,
    link                varchar(1024),
    image               varchar(1024),
    copyright           varchar(80),
    generator           varchar(80),
    language            varchar(40),
    parent_id           integer
                            REFERENCES urls(id)
                            ON DELETE CASCADE,
    child_count         integer DEFAULT 0,
    last_update         timestamp NOT NULL DEFAULT (CURRENT_TIMESTAMP)
);

--
-- Ensure the 'url' column is unique
--

DROP INDEX IF EXISTS url_index;

CREATE UNIQUE INDEX url_index ON urls ( url );

--
-- Trigger to update the 'last_update' field every time the row changes
--

DROP TRIGGER IF EXISTS urls_last_updated;

CREATE TRIGGER urls_last_updated AFTER UPDATE ON urls
    BEGIN
        UPDATE urls SET last_update = datetime('now');
    END;

/*
 * Table 'episodes'
 * ----------------
 *
 * Has a foreign key relationship with table 'urls'. If the matching row in
 * 'urls' is deleted the deletion cascades to this table (ON DELETE CASCADE).
 * If the primary key in 'urls' is updated the relationship prevents this
 * change (ON UPDATE RESTRICT).
 */

DROP TABLE IF EXISTS episodes;

CREATE TABLE episodes (
    id                  integer PRIMARY KEY,
    urls_id             integer NOT NULL
                            REFERENCES urls (id)
                            ON DELETE CASCADE
                            ON UPDATE RESTRICT,
    link                varchar(1024),
    enclosure           varchar(256),
    title               varchar(256),
    author              varchar(256),
    category            text,
    source              varchar(128),
    ep_id               varchar(256),
    issued              timestamp,
    modified            timestamp,
    byte_length         bigint,
    mime_type           varchar(64),
    last_update         timestamp NOT NULL DEFAULT (CURRENT_TIMESTAMP)
);

--
-- Ensure the 'enclosure' column is unique (per feed)
--

DROP INDEX IF EXISTS enclosure_index;

CREATE UNIQUE INDEX enclosure_index ON episodes ( urls_id, enclosure );

--
-- Trigger to update the 'last_update' field every time the row changes
--

DROP TRIGGER IF EXISTS episodes_last_updated;

CREATE TRIGGER episodes_last_updated AFTER UPDATE ON episodes
    BEGIN
        UPDATE episodes SET last_update = datetime('now');
    END;

--
-- View to simplify joining the two tables.
--

DROP VIEW IF EXISTS all_episodes;

CREATE VIEW all_episodes AS
    SELECT
        urls.id as urls_id,
        urls.url as urls_url,
        urls.dns as urls_dns,
        urls.host_up as urls_host_up,
        urls.http_status as urls_http_status,
        urls.content_type as urls_content_type,
        urls.urltype as urls_urltype,
        urls.feedformat as urls_feedformat,
        urls.title as urls_title,
        urls.description as urls_description,
        urls.author as urls_author,
        urls.modified as urls_modified,
        urls.link as urls_link,
        urls.image as urls_image,
        urls.copyright as urls_copyright,
        urls.generator as urls_generator,
        urls.language as urls_language,
        urls.parent_id as urls_parent_id,
        urls.child_count as urls_child_count,
        urls.last_update as urls_last_update,
        ep.id as ep_id,
        ep.urls_id as ep_urls_id,
        ep.link as ep_link,
        ep.enclosure as ep_enclosure,
        ep.title as ep_title,
        ep.author as ep_author,
        ep.category as ep_category,
        ep.source as ep_source,
        ep.ep_id as ep_ep_id,
        ep.issued as ep_issued,
        ep.modified as ep_modified,
        ep.byte_length as ep_byte_length,
        ep.mime_type as ep_mime_type,
        ep.last_update as ep_last_update
    FROM urls LEFT JOIN episodes ep ON urls.id = ep.urls_id;

-- vim: syntax=sql:ts=8:ai:tw=78:et:fo=tcrqn21:comments+=b\:--