-- 021_sessions.sql (SQLite)
-- Anonymous / session participants for workflow channels (v0.24.3)

CREATE TABLE IF NOT EXISTS session_participants (
    id            TEXT PRIMARY KEY,
    session_token TEXT NOT NULL UNIQUE,
    channel_id    TEXT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    display_name  TEXT NOT NULL DEFAULT 'Visitor',
    fingerprint   TEXT,
    created_at    DATETIME NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_session_participants_channel
    ON session_participants(channel_id);

CREATE INDEX IF NOT EXISTS idx_session_participants_token
    ON session_participants(session_token);

-- Allow channels to opt in to anonymous session access.
ALTER TABLE channels ADD COLUMN allow_anonymous INTEGER NOT NULL DEFAULT 0;