Phase 6: Expand market rates and enhance AI investment recommendations

- Rate fetcher now scrapes CD, Money Market, and High Yield Savings rates
  from Bankrate.com with pauses between fetches to avoid rate limiting
- Historical rate data is preserved (no longer deleted on each fetch)
- Database migration adds rate_type column and tenant ai_recommendations table
- Backend returns market rates grouped by type with latest-batch-only queries
- AI prompt now includes all three rate types for comprehensive analysis
- AI recommendations are saved per-tenant for retrieval on page load
- Frontend: "Market CD Rates" replaced with "Today's Market Rates" tabbed view
- Rates section is collapsible (expanded by default) to save screen space
- Saved recommendations load automatically with "Last Updated" timestamp

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

db/migrations/007-market-rates.sql

@@ -0,0 +1,36 @@
+-- Migration: Expand cd_rates for multiple market rate types + tenant AI recommendation storage
+-- Phase 6: AI Features Part 2
+
+-- 1) Add rate_type column to shared.cd_rates to support CD, Money Market, and High Yield Savings
+ALTER TABLE shared.cd_rates
+  ADD COLUMN IF NOT EXISTS rate_type VARCHAR(50) DEFAULT 'cd' NOT NULL;
+
+-- Index for filtering by rate type
+CREATE INDEX IF NOT EXISTS idx_cd_rates_type ON shared.cd_rates(rate_type);
+
+-- Composite index for getting latest rates by type efficiently
+CREATE INDEX IF NOT EXISTS idx_cd_rates_type_fetched ON shared.cd_rates(rate_type, fetched_at DESC);
+
+-- 2) Create ai_recommendations table in each existing tenant schema
+-- This stores saved AI investment recommendations per tenant
+-- For new tenants, this is handled by tenant-schema.service.ts
+DO $$
+DECLARE
+  tenant_schema TEXT;
+BEGIN
+  FOR tenant_schema IN
+    SELECT schema_name FROM shared.organizations WHERE schema_name IS NOT NULL
+  LOOP
+    EXECUTE format(
+      'CREATE TABLE IF NOT EXISTS %I.ai_recommendations (
+        id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+        recommendations_json JSONB NOT NULL,
+        overall_assessment TEXT,
+        risk_notes JSONB,
+        requested_by UUID,
+        response_time_ms INTEGER,
+        created_at TIMESTAMPTZ DEFAULT NOW()
+      )', tenant_schema
+    );
+  END LOOP;
+END $$;