feat: add database migration for service-to-offers refactor

- Add service_id column to offers table
- Remove offer_id column from services table
- Update VERSION to 0.4.0 in wrangler.toml

migrations/0006_service_offer_refactor.sql

@@ -0,0 +1,40 @@
+-- V0.4.0 Migration: Refactor service-to-offer relationship
+-- Change from one-to-one (service has offer_id) to one-to-many (offer has service_id)
+
+-- Step 1: Add service_id column to offers table
+ALTER TABLE offers ADD COLUMN service_id TEXT;
+
+-- Step 2: Create new services table without offer_id
+CREATE TABLE services_new (
+  id TEXT PRIMARY KEY,
+  username TEXT NOT NULL,
+  service_fqn TEXT NOT NULL,
+  created_at INTEGER NOT NULL,
+  expires_at INTEGER NOT NULL,
+  is_public INTEGER NOT NULL DEFAULT 0,
+  metadata TEXT,
+  FOREIGN KEY (username) REFERENCES usernames(username) ON DELETE CASCADE,
+  UNIQUE(username, service_fqn)
+);
+
+-- Step 3: Copy data from old services table (if any exists)
+INSERT INTO services_new (id, username, service_fqn, created_at, expires_at, is_public, metadata)
+SELECT id, username, service_fqn, created_at, expires_at, is_public, metadata
+FROM services;
+
+-- Step 4: Drop old services table
+DROP TABLE services;
+
+-- Step 5: Rename new table to services
+ALTER TABLE services_new RENAME TO services;
+
+-- Step 6: Recreate indexes
+CREATE INDEX IF NOT EXISTS idx_services_username ON services(username);
+CREATE INDEX IF NOT EXISTS idx_services_fqn ON services(service_fqn);
+CREATE INDEX IF NOT EXISTS idx_services_expires ON services(expires_at);
+
+-- Step 7: Add index for service_id in offers
+CREATE INDEX IF NOT EXISTS idx_offers_service ON offers(service_id);
+
+-- Step 8: Add foreign key constraint (D1 doesn't enforce FK in ALTER, but good for documentation)
+-- FOREIGN KEY (service_id) REFERENCES services(id) ON DELETE CASCADE

wrangler.toml

@@ -17,7 +17,7 @@ OFFER_MIN_TTL = "60000"  # Min offer TTL: 1 minute
 MAX_OFFERS_PER_REQUEST = "100"  # Max offers per request
 MAX_TOPICS_PER_OFFER = "50"  # Max topics per offer
 CORS_ORIGINS = "*"  # Comma-separated list of allowed origins
-VERSION = "0.1.0"  # Semantic version
+VERSION = "0.4.0"  # Semantic version
 
 # AUTH_SECRET should be set as a secret, not a var
 # Run: npx wrangler secret put AUTH_SECRET