refactor(core): move database schema ownership (#29068)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

packages/core/src/snapshot.ts

@@ -0,0 +1,9 @@
+export namespace Snapshot {
+  export type FileDiff = {
+    file?: string
+    patch?: string
+    additions: number
+    deletions: number
+    status?: "added" | "deleted" | "modified"
+  }
+}