comment-server/schema/comments_ddl.sql

PRAGMA FOREIGN_KEYS = ON;

-- tables
-- DROP TABLE IF EXISTS COMMENT;
-- DROP TABLE IF EXISTS CHANNEL;

-- DROP TABLE IF EXISTS COMMENT;
CREATE TABLE IF NOT EXISTS COMMENT (
    CommentId   TEXT    NOT NULL,
    LbryClaimId TEXT    NOT NULL,
    ChannelId   TEXT                DEFAULT NULL,
    Body        TEXT    NOT NULL,
    ParentId    TEXT                DEFAULT NULL,
    Signature   TEXT                DEFAULT NULL,
    Timestamp   INTEGER NOT NULL,
    SigningTs   TEXT                DEFAULT NULL,
    CONSTRAINT COMMENT_PRIMARY_KEY PRIMARY KEY (CommentId) ON CONFLICT IGNORE,
    CONSTRAINT COMMENT_SIGNATURE_SK UNIQUE (Signature) ON CONFLICT ABORT,
    CONSTRAINT COMMENT_CHANNEL_FK FOREIGN KEY (ChannelId) REFERENCES CHANNEL(ClaimId)
        ON DELETE NO ACTION ON UPDATE NO ACTION,
    CONSTRAINT COMMENT_PARENT_FK FOREIGN KEY (ParentId) REFERENCES COMMENT(CommentId)
        ON UPDATE CASCADE ON DELETE NO ACTION  -- setting null implies comment is top level
);

-- ALTER TABLE COMMENT ADD COLUMN SigningTs TEXT DEFAULT NULL;

-- DROP TABLE IF EXISTS CHANNEL;
CREATE TABLE IF NOT EXISTS CHANNEL(
    ClaimId     TEXT    NOT NULL,
    Name        TEXT    NOT NULL,
    CONSTRAINT CHANNEL_PK PRIMARY KEY (ClaimId)
        ON CONFLICT IGNORE
);


-- indexes
-- DROP INDEX IF EXISTS COMMENT_CLAIM_INDEX;
CREATE INDEX IF NOT EXISTS CLAIM_COMMENT_INDEX ON COMMENT (LbryClaimId, CommentId);

CREATE INDEX IF NOT EXISTS CHANNEL_COMMENT_INDEX ON COMMENT (ChannelId, CommentId);


-- VIEWS
DROP VIEW IF EXISTS COMMENTS_ON_CLAIMS;
CREATE VIEW IF NOT EXISTS COMMENTS_ON_CLAIMS (comment_id, claim_id, timestamp, channel_name, channel_id, channel_url, signature, signing_ts, parent_id, comment) AS
    SELECT C.CommentId, C.LbryClaimId, C.Timestamp, CHAN.Name, CHAN.ClaimId, 'lbry://' || CHAN.Name || '#' || CHAN.ClaimId, C.Signature, C.SigningTs, C.ParentId, C.Body
    FROM COMMENT AS C
    LEFT OUTER JOIN CHANNEL CHAN on C.ChannelId = CHAN.ClaimId
    ORDER BY C.Timestamp DESC;



DROP VIEW IF EXISTS COMMENT_REPLIES;
CREATE VIEW IF NOT EXISTS COMMENT_REPLIES (Author, CommentBody, ParentAuthor, ParentCommentBody) AS
    SELECT AUTHOR.Name, OG.Body, PCHAN.Name, PARENT.Body FROM COMMENT AS OG
        JOIN  COMMENT AS PARENT
        ON OG.ParentId = PARENT.CommentId
        JOIN CHANNEL AS PCHAN ON PARENT.ChannelId = PCHAN.ClaimId
        JOIN CHANNEL AS AUTHOR ON OG.ChannelId = AUTHOR.ClaimId
        ORDER BY OG.Timestamp;

-- this is the default channel for anyone who wants to publish anonymously
-- INSERT INTO CHANNEL
-- VALUES ('9cb713f01bf247a0e03170b5ed00d5161340c486', '@Anonymous');