-- Timeline events and AI usage tracking

CREATE TABLE timeline_events (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    entity_type TEXT NOT NULL CHECK (entity_type IN ('roaster', 'roast', 'bag', 'gear', 'brew', 'cafe', 'cup')),
    entity_id INTEGER NOT NULL,
    action TEXT NOT NULL,
    occurred_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
    title TEXT NOT NULL,
    details_json TEXT,
    tasting_notes_json TEXT,
    slug TEXT,
    roaster_slug TEXT,
    brew_data_json TEXT
);
CREATE INDEX idx_timeline_events_entity ON timeline_events(entity_type, entity_id);
CREATE INDEX idx_timeline_events_occurred_at ON timeline_events(occurred_at DESC);

CREATE TABLE ai_usage (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    model TEXT NOT NULL,
    endpoint TEXT NOT NULL,
    prompt_tokens INTEGER NOT NULL,
    completion_tokens INTEGER NOT NULL,
    total_tokens INTEGER NOT NULL,
    cost REAL NOT NULL,
    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
);
CREATE INDEX idx_ai_usage_user_id ON ai_usage(user_id);