feat: add better auth sqlite runtime and server-side session flow

server/db/transaction.ts

@@ -0,0 +1,25 @@
+import "server-only";
+
+import { getSqliteConnection, type SqliteConnection } from "@/server/db/client";
+
+let transactionDepth = 0;
+
+export function runInTransaction<T>(operation: (connection: SqliteConnection) => T): T {
+  const connection = getSqliteConnection();
+
+  if (transactionDepth > 0) {
+    return operation(connection);
+  }
+
+  const execute = connection.sqlite.transaction(() => {
+    transactionDepth += 1;
+
+    try {
+      return operation(connection);
+    } finally {
+      transactionDepth -= 1;
+    }
+  });
+
+  return execute();
+}