Phase 5: alert subscriptions UI + multiple watchlists + queue fixes

UI:
- /alerts page: event history with acknowledge, subscription create/manage with toggle
- /admin/smtp: SMTP config form (host, port, auth, test)
- Watchlist sidebar: dropdown selector for multiple watchlists, create/delete
- Sidebar: alerts count badge, SMTP link under admin
- Mobile tab nav: alerts tab added
- Client trpc.ts: all new API methods + types

Backend:
- watchlists.listByWatchlist procedure + listSymbolsByWatchlist repo fn
- yfinance min-interval 1500->2000ms to reduce Edge 429s
- Fixed e.date.slice error in yfinance-adjustments with typeof guard
- Removed defunct BITF from watchlist+queue
- Cleared 83 failed + 12 backoff queue jobs

Docs:
- FUNCTIONAL_DESIGN.md: alerts + multiple watchlists + SMTP documented
- TECH_DESIGN.md: new modules, tRPC procs, routes updated

app/server/src/db/client.ts

@@ -134,7 +134,12 @@ function runMigrations(db: DatabaseSync): void {
     db.exec(`CREATE UNIQUE INDEX IF NOT EXISTS uq_inst_filings ON institution_filings(filer_cik, symbol, reported_quarter, form)`);
   } catch { /* ignore */ }
 
-  // 4. Data-quality lint table.
+  // 4. Rename legacy 'Starter' watchlist to 'default'.
+  try {
+    db.exec(`UPDATE watchlists SET name='default' WHERE name='Starter'`);
+  } catch { /* ignore */ }
+
+  // 5. Data-quality lint table.
   try {
     db.exec(`
       CREATE TABLE IF NOT EXISTS data_quality (
@@ -152,7 +157,7 @@ function runMigrations(db: DatabaseSync): void {
     `);
   } catch { /* ignore */ }
 
-  // 5. Analyst ratings / upgrades & downgrades (yahoo-finance2).
+  // 6. Analyst ratings / upgrades & downgrades (yahoo-finance2).
   try { db.exec(`ALTER TABLE analyst_ratings ADD COLUMN target_from REAL`); } catch { /* ignore */ }
   try { db.exec(`ALTER TABLE analyst_ratings ADD COLUMN target_to REAL`); } catch { /* ignore */ }
   try {
@@ -182,6 +187,41 @@ function runMigrations(db: DatabaseSync): void {
         strong_sell INTEGER NOT NULL DEFAULT 0,
         fetched_at  TEXT NOT NULL
       )
+      `);
+    } catch { /* ignore */ }
+
+  // 7. Alert subscriptions: add watchlist_id + enabled columns (existing DBs).
+  try { db.exec(`ALTER TABLE alerts ADD COLUMN watchlist_id TEXT`); } catch { /* ignore */ }
+  try { db.exec(`ALTER TABLE alerts ADD COLUMN enabled INTEGER NOT NULL DEFAULT 1`); } catch { /* ignore */ }
+
+  // 8. Alert comparison state table.
+  try {
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS alert_comparison_state (
+        symbol      TEXT NOT NULL,
+        alert_type  TEXT NOT NULL,
+        state       TEXT NOT NULL DEFAULT '{}',
+        updated_at  TEXT NOT NULL,
+        PRIMARY KEY (symbol, alert_type)
+      )
+      `);
+    } catch { /* ignore */ }
+
+  // 9. SMTP config table for email alerts.
+  try {
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS smtp_config (
+        id          TEXT PRIMARY KEY DEFAULT 'singleton',
+        host        TEXT NOT NULL DEFAULT 'smtp.mail.me.com',
+        port        INTEGER NOT NULL DEFAULT 587,
+        secure      INTEGER NOT NULL DEFAULT 0,
+        user        TEXT,
+        pass_enc    TEXT,
+        from_name   TEXT NOT NULL DEFAULT 'Investor Flow',
+        from_email  TEXT NOT NULL DEFAULT '',
+        enabled     INTEGER NOT NULL DEFAULT 0,
+        updated_at  TEXT NOT NULL
+      )
     `);
   } catch { /* ignore */ }
 }