-- 005_market_history.sql
--
-- Adds the rolling market-history substrate (window length from env):
--   * timeframe column + idempotent unique observation key on
--     market_data_snapshots
--   * tradable_assets cache for the daily Alpaca asset universe
--   * market_data_sync_runs audit table
-- See TODO.md §1.

ALTER TABLE market_data_snapshots
  ADD COLUMN IF NOT EXISTS timeframe TEXT NOT NULL DEFAULT 'tick';

ALTER TABLE market_data_snapshots
  DROP CONSTRAINT IF EXISTS market_data_snapshots_unique_obs;

ALTER TABLE market_data_snapshots
  ADD CONSTRAINT market_data_snapshots_unique_obs
  UNIQUE (symbol, metric, timeframe, as_of);

CREATE INDEX IF NOT EXISTS market_data_snapshots_asof_idx
  ON market_data_snapshots (as_of DESC);

CREATE TABLE IF NOT EXISTS tradable_assets (
  symbol        TEXT PRIMARY KEY,
  asset_class   TEXT NOT NULL DEFAULT 'us_equity',
  exchange      TEXT,
  name          TEXT,
  tradable      BOOLEAN NOT NULL DEFAULT true,
  fractionable  BOOLEAN NOT NULL DEFAULT false,
  status        TEXT NOT NULL DEFAULT 'active',
  raw           JSONB,
  refreshed_at  TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS tradable_assets_status_idx
  ON tradable_assets (status, tradable);

CREATE TABLE IF NOT EXISTS market_data_sync_runs (
  id            BIGSERIAL PRIMARY KEY,
  kind          TEXT NOT NULL,
  started_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
  finished_at   TIMESTAMPTZ,
  rows_written  INTEGER NOT NULL DEFAULT 0,
  rows_removed  INTEGER NOT NULL DEFAULT 0,
  error         TEXT
);

CREATE INDEX IF NOT EXISTS market_data_sync_runs_kind_started_idx
  ON market_data_sync_runs (kind, started_at DESC);

-- The market_data_archive table is intentionally deferred to TODO.md
-- section 4.2 (Phase 2 archive mode) and will be added when
-- MarketDataRetention.runArchiveAndCleanup is implemented.