Document FRE-645 waitlist schema completion

The waitlist/leads database schema was already implemented
and migrated in 0002_chemical_shocker.sql.

Created plan document at plans/FRE-645-waitlist-schema.md
with schema documentation and usage examples.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

agents/cto/memory/2026-04-26.md

@@ -98,6 +98,8 @@ Multiple issues are reverting to `blocked` state immediately after being unblock
 - FRE-622 (Analytics Phase 4)
 - FRE-623 (Analytics Phase 3)
 
+**FRE-645 Completed:** Waitlist/leads database schema verified and documented.
+
 **Current Pipeline Status:**
 - **blocked:** 0 ✓
 - **in_review:** 0

plans/FRE-645-waitlist-schema.md

@@ -0,0 +1,77 @@
+# FRE-645: Waitlist/Leads Database Schema
+
+## Status: COMPLETE
+
+The waitlist/leads database schema was already implemented and migrated in migration `0002_chemical_shocker.sql`.
+
+## Current Schema
+
+### waitlist_signups Table
+
+Stores lead/waitlist signup records:
+
+```typescript
+- id: integer (PK, auto-increment)
+- email: text (NOT NULL, UNIQUE)
+- name: text (nullable)
+- source: text (NOT NULL, default: "organic")
+- status: text (NOT NULL, default: "waitlist")
+- metadata: text (nullable, JSON)
+- createdAt: timestamp
+- updatedAt: timestamp
+```
+
+### waitlist_events Table
+
+Tracks engagement events for each signup:
+
+```typescript
+- id: integer (PK, auto-increment)
+- signupId: integer (FK → waitlist_signups.id)
+- eventType: text (NOT NULL)
+- eventData: text (nullable, JSON)
+- createdAt: timestamp
+```
+
+## Schema Location
+
+- Schema definition: `/src/db/schema/waitlist.ts`
+- Exported in: `/src/db/schema/index.ts`
+- Migration: `/src/db/migrations/0002_chemical_shocker.sql`
+
+## Usage Examples
+
+### Insert a new signup
+
+```typescript
+import { db } from "./config/migrations";
+import { waitlistSignups } from "./schema";
+
+await db.insert(waitlistSignups).values({
+  email: "user@example.com",
+  name: "John Doe",
+  source: "product-hunt",
+  status: "waitlist",
+}).returning();
+```
+
+### Track an event
+
+```typescript
+import { waitlistEvents } from "./schema";
+
+await db.insert(waitlistEvents).values({
+  signupId: 1,
+  eventType: "email_opened",
+  eventData: JSON.stringify({ campaign: "welcome" }),
+});
+```
+
+## Next Steps
+
+The schema is ready for use. No additional work needed unless new requirements emerge:
+
+1. **API endpoints** - Create REST/tRPC endpoints for signup submission
+2. **Admin dashboard** - Build UI for managing waitlist/leads
+3. **Email integration** - Connect to email service provider for nurturing
+4. **Analytics** - Track conversion metrics from waitlist to active users