fix: user notification/request counts

crates/core/src/database/drivers/sql/version_migrations.sql

@@ -9,3 +9,7 @@ ADD COLUMN IF NOT EXISTS is_deactivated INT DEFAULT 0;
 -- apps storage_capacity
 ALTER TABLE apps
 ADD COLUMN IF NOT EXISTS storage_capacity TEXT DEFAULT '"Tier1"';
+
+-- letters replying_to
+ALTER TABLE letters
+ADD COLUMN IF NOT EXISTS replying_to TEXT DEFAULT 0;