auto-claude: subtask-1-2 - Apply migration to Supabase database

Created migration application scripts and comprehensive documentation:
- scripts/apply-migration.js - Automated migration (requires service role key)
- scripts/verify-migration.js - Table verification script
- scripts/test-env.js - Environment diagnostics
- supabase/APPLY_MIGRATION.md - Comprehensive migration guide
- supabase/MIGRATION_INSTRUCTIONS.md - Quick reference

Manual application via Supabase dashboard is recommended approach.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/APPLY_MIGRATION.md

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+# How to Apply the Rate Limits Migration
+
+## Quick Start (Manual Application)
+
+Since the Supabase CLI is not configured for this project, please follow these steps to apply the migration manually through the Supabase dashboard:
+
+### Step 1: Access the SQL Editor
+
+Open the Supabase SQL Editor in your browser:
+```
+https://app.supabase.com/project/mxadgucxhmstlzsbgmoz/sql
+```
+
+### Step 2: Copy the Migration SQL
+
+Open the migration file:
+```
+supabase/migrations/20260125_create_rate_limits_table.sql
+```
+
+Copy the entire contents (approximately 42 lines of SQL).
+
+### Step 3: Execute the Migration
+
+1. In the SQL Editor, paste the copied SQL
+2. Click the **"RUN"** button (or press `Ctrl+Enter` / `Cmd+Enter`)
+3. Wait for the success message: "Success. No rows returned"
+
+### Step 4: Verify the Table Was Created
+
+**Option A: Using Table Editor**
+1. Navigate to: https://app.supabase.com/project/mxadgucxhmstlzsbgmoz/editor
+2. Look for **"rate_limits"** in the table list (left sidebar)
+3. Click on it to see the table structure
+
+**Option B: Using SQL Query**
+Run this query in the SQL Editor:
+```sql
+SELECT
+  table_name,
+  column_name,
+  data_type,
+  is_nullable
+FROM information_schema.columns
+WHERE table_name = 'rate_limits'
+ORDER BY ordinal_position;
+```
+
+You should see 5 rows (one for each column):
+- identifier (text)
+- count (integer)
+- window_start (timestamp with time zone)
+- created_at (timestamp with time zone)
+- updated_at (timestamp with time zone)
+
+**Option C: Check Indexes**
+Run this query to verify indexes were created:
+```sql
+SELECT
+  indexname,
+  indexdef
+FROM pg_indexes
+WHERE tablename = 'rate_limits';
+```
+
+You should see:
+- Primary key on (identifier, window_start)
+- idx_rate_limits_identifier_window
+- idx_rate_limits_window_start
+
+## Troubleshooting
+
+### Error: "relation 'rate_limits' already exists"
+
+The table is already created! No action needed. Verify it exists using the verification steps above.
+
+### Error: "permission denied"
+
+Make sure you're:
+1. Logged into the correct Supabase account
+2. Have admin/owner permissions on the project
+3. Using the correct project URL
+
+### Table not visible in Table Editor
+
+1. Refresh the page (F5)
+2. Check the SQL output for error messages
+3. Try the SQL verification query in Option B above
+
+### Need to Revert/Drop the Table?
+
+If you need to start over, run this SQL:
+```sql
+DROP TABLE IF EXISTS rate_limits CASCADE;
+```
+
+Then re-apply the migration from Step 1.
+
+## Alternative: Automated Scripts
+
+We've provided scripts for automated migration, but they require additional setup:
+
+### Using apply-migration.js (requires service role key)
+
+1. Add `SUPABASE_SERVICE_ROLE_KEY` to `.env.local`
+2. Run: `node scripts/apply-migration.js`
+
+### Using Supabase CLI (if installed)
+
+```bash
+supabase migration up
+```
+
+## Next Steps
+
+After the migration is applied successfully:
+1. ✅ Verify the table exists (see Step 4 above)
+2. ✅ Mark this subtask as complete
+3. ✅ Proceed to Phase 2: Building the rate limiting utility

supabase/MIGRATION_INSTRUCTIONS.md

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+# Supabase Migration Instructions
+
+## Apply Migration: Create rate_limits Table
+
+### Quick Steps
+
+1. **Open Supabase SQL Editor**
+   - Go to: https://app.supabase.com/project/mxadgucxhmstlzsbgmoz/sql
+
+2. **Copy Migration SQL**
+   - Open: `supabase/migrations/20260125_create_rate_limits_table.sql`
+   - Copy all contents (Ctrl+A, Ctrl+C)
+
+3. **Execute Migration**
+   - Paste the SQL into the Supabase SQL editor
+   - Click the "Run" button (or press Ctrl+Enter)
+   - Wait for "Success. No rows returned" message
+
+4. **Verify Table Creation**
+   - Go to Table Editor: https://app.supabase.com/project/mxadgucxhmstlzsbgmoz/editor
+   - Look for "rate_limits" table in the list
+   - Click on it to verify the schema
+
+### Expected Table Schema
+
+The `rate_limits` table should have:
+
+| Column | Type | Description |
+|--------|------|-------------|
+| identifier | TEXT | Client identifier (IP address) |
+| count | INTEGER | Number of requests in window |
+| window_start | TIMESTAMPTZ | Start of rate limit window |
+| created_at | TIMESTAMPTZ | When record was created |
+| updated_at | TIMESTAMPTZ | When record was last updated |
+
+**Primary Key:** (identifier, window_start)
+
+**Indexes:**
+- `idx_rate_limits_identifier_window` on (identifier, window_start DESC)
+- `idx_rate_limits_window_start` on (window_start)
+
+### Alternative: Using Supabase CLI (if available)
+
+If you have Supabase CLI installed:
+
+```bash
+supabase db push
+```
+
+Or apply the specific migration:
+
+```bash
+supabase migration up
+```
+
+### Verification Query
+
+Run this query in the SQL editor to verify the table exists:
+
+```sql
+SELECT
+  table_name,
+  column_name,
+  data_type,
+  is_nullable
+FROM information_schema.columns
+WHERE table_name = 'rate_limits'
+ORDER BY ordinal_position;
+```
+
+You should see all 5 columns listed.
+
+### Troubleshooting
+
+**Error: "relation already exists"**
+- The table already exists. You can verify by checking Table Editor.
+
+**Error: "permission denied"**
+- Make sure you're logged into the correct Supabase project.
+- Verify you have admin/owner access to the project.
+
+**Table not appearing in Table Editor**
+- Refresh the page (F5)
+- Check the SQL editor for any error messages
+- Verify the SQL was executed successfully