slice 16 X-cookie + Reddit adapters (qwopus35b): cashtag_search/trusted_timeline (1 req/3s, cookie-expiry->FAILED+degraded), Reddit public-JSON, 7d cache, FakeLLM, crowd-sentiment-not-edge caveat

Cross-review by ornith-35 pending. 17 new tests (40 adapter total).

app/server/src/db/schema.sql

@@ -339,7 +339,43 @@ CREATE TABLE IF NOT EXISTS llm_dispatch_audit (
   ts            TEXT NOT NULL
 );
 
--- ===== Indexes =====
+-- ===== Slice 16 — Sentiment / X-cookie / Reddit tables =====
+-- sentiment_score: -1.0 (bearish) to +1.0 (bullish), computed by LLM post_summary or heuristic.
+-- attribution: author_handle preserved on every cached post per M8.
+-- cached_until: 7d rolling TTL; rows become stale after this window.
+CREATE TABLE IF NOT EXISTS x_cookie_posts (
+  post_id         TEXT NOT NULL,
+  source          TEXT NOT NULL DEFAULT 'x',
+  author_handle   TEXT NOT NULL,
+  cashtag         TEXT,                        -- e.g. 'NVDA' — null if not a cashtag search
+  body_text       TEXT,
+  posted_at       TEXT NOT NULL,
+  engagement      INTEGER NOT NULL DEFAULT 0,  -- likes + retweets + replies
+  sentiment_score REAL,                        -- -1.0 to +1.0
+  attribution     TEXT,                        -- original author handle (may differ from author_handle for quotes/retweets)
+  cached_until    TEXT NOT NULL,               -- 7d rolling; rows stale after this
+  PRIMARY KEY (post_id)
+);
+
+CREATE TABLE IF NOT EXISTS reddit_posts (
+  post_id         TEXT NOT NULL,
+  source          TEXT NOT NULL DEFAULT 'reddit',
+  author_handle   TEXT NOT NULL,
+  subreddit       TEXT NOT NULL,
+  body_text       TEXT,
+  posted_at       TEXT NOT NULL,
+  engagement      INTEGER NOT NULL DEFAULT 0,  -- upvotes + comments
+  sentiment_score REAL,                        -- -1.0 to +1.0
+  attribution     TEXT,                        -- original author handle (may differ for cross-posts)
+  cached_until    TEXT NOT NULL,               -- 7d rolling
+  PRIMARY KEY (post_id)
+);
+
+-- Indexes for slice-16 sentiment tables
+CREATE INDEX IF NOT EXISTS idx_x_cookie_cashtag ON x_cookie_posts(cashtag, posted_at DESC);
+CREATE INDEX IF NOT EXISTS idx_reddit_subreddit ON reddit_posts(subreddit, posted_at DESC);
+
+-- ===== Indexes (existing) =====
 CREATE INDEX IF NOT EXISTS idx_pc_symbol_tf_ts ON price_candles(symbol, timeframe, ts);
 CREATE INDEX IF NOT EXISTS idx_quote_obs ON quotes(observed_at);
 CREATE INDEX IF NOT EXISTS idx_filing_symbol_form ON filings(symbol, form);