feat(db): add DLOB latest tables

kustomize/base/initdb/001_init.sql

@@ -163,3 +163,51 @@ AS $$
   ORDER BY bucket DESC
   LIMIT p_limit;
 $$;
+
+-- Latest DLOB orderbook snapshots (top-N levels), per market.
+-- Filled by a VPS worker (collector) and consumed by the UI via Hasura subscriptions.
+CREATE TABLE IF NOT EXISTS public.dlob_l2_latest (
+  market_name TEXT PRIMARY KEY,
+  market_type TEXT NOT NULL DEFAULT 'perp',
+  market_index INTEGER,
+  ts BIGINT,
+  slot BIGINT,
+  mark_price NUMERIC,
+  oracle_price NUMERIC,
+  best_bid_price NUMERIC,
+  best_ask_price NUMERIC,
+  bids JSONB,
+  asks JSONB,
+  raw JSONB,
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS dlob_l2_latest_updated_at_idx
+  ON public.dlob_l2_latest (updated_at DESC);
+
+-- Derived stats for fast UI display.
+CREATE TABLE IF NOT EXISTS public.dlob_stats_latest (
+  market_name TEXT PRIMARY KEY,
+  market_type TEXT NOT NULL DEFAULT 'perp',
+  market_index INTEGER,
+  ts BIGINT,
+  slot BIGINT,
+  mark_price NUMERIC,
+  oracle_price NUMERIC,
+  best_bid_price NUMERIC,
+  best_ask_price NUMERIC,
+  mid_price NUMERIC,
+  spread_abs NUMERIC,
+  spread_bps NUMERIC,
+  depth_levels INTEGER,
+  depth_bid_base NUMERIC,
+  depth_ask_base NUMERIC,
+  depth_bid_usd NUMERIC,
+  depth_ask_usd NUMERIC,
+  imbalance NUMERIC,
+  raw JSONB,
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS dlob_stats_latest_updated_at_idx
+  ON public.dlob_stats_latest (updated_at DESC);