Add D1 migration baseline

cloudflare/migrations/0001_devices.sql

@@ -0,0 +1,36 @@
+CREATE TABLE IF NOT EXISTS user_devices (
+  user_id TEXT NOT NULL,
+  device_id TEXT NOT NULL,
+  public_key TEXT NOT NULL,
+  device_name TEXT NOT NULL,
+  platform TEXT NOT NULL,
+  approval_status TEXT NOT NULL CHECK (approval_status IN ('pending', 'approved', 'revoked')),
+  created_at INTEGER NOT NULL,
+  approved_at INTEGER,
+  last_active_at INTEGER,
+  revoked_at INTEGER,
+  idempotency_key TEXT NOT NULL,
+  PRIMARY KEY (user_id, device_id),
+  UNIQUE (user_id, idempotency_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_devices_user_active
+  ON user_devices (user_id, revoked_at, last_active_at);
+
+CREATE TABLE IF NOT EXISTS device_approvals (
+  user_id TEXT NOT NULL,
+  approval_id TEXT NOT NULL,
+  device_id TEXT NOT NULL,
+  requester_device_id TEXT NOT NULL,
+  status TEXT NOT NULL CHECK (status IN ('pending', 'approved', 'rejected', 'expired')),
+  requested_at INTEGER NOT NULL,
+  decided_at INTEGER,
+  expires_at INTEGER NOT NULL,
+  idempotency_key TEXT NOT NULL,
+  PRIMARY KEY (user_id, approval_id),
+  UNIQUE (user_id, idempotency_key),
+  FOREIGN KEY (user_id, device_id) REFERENCES user_devices (user_id, device_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_device_approvals_user_status
+  ON device_approvals (user_id, status, expires_at);