diff --git a/MEMORY.md b/MEMORY.md
index 5b78b11..7f87e59 100644
--- a/MEMORY.md
+++ b/MEMORY.md
@@ -191,3 +191,9 @@
 - Frontend: uses `kit.alias` in `vite.config.ts` (NOT `paths` in `frontend/tsconfig.json`, which SvelteKit warns against). Frontend imports shared files **without** the `.ts` extension (`@shared/timezone`) because `rewriteRelativeImportExtensions` only rewrites relative paths.
 - Verified: proxy build + frontend build + `svelte-check` all clean for `@shared/*` (svelte-check still reports pre-existing `qrcode` types + CSS warnings).
 - Docker note: runtime image only copies `frontend/build` + `proxy/dist` (both already bundle `shared/`), so `shared/` needn't be copied into the image.
+
+### 2026-08-10 — Revert PB to 0.25.8 (backtrack from 0.39)
+- **Decision**: backtrack off the PocketBase 0.39 bump (introduced in commit `3725c54` via `ARG POCKETBASE_VERSION=0.39.10`) and work from a **0.25.8 baseline** in BOTH dev and prod, then migrate to 0.39 deliberately later.
+- Reverted `docker/Dockerfile` `POCKETBASE_VERSION` back to `0.25.8` (matches `docker/Dockerfile.dev`). Dev `pb-dev` and the docker app internal PB `:8091` share host `./pb_data`.
+- **Migration schema scripts (DO NOT FORGET)**: the schema single source of truth is `shared/pb/schema.ts` (`SCHEMA_PLAN`), iterated by `proxy/src/migrate.ts` (`ensureSchema`) and `proxy/scripts/seed.ts`. The chat `messages` / `chat_typing` collections are defined there **without** an explicit `createdAt` — they rely on PB auto-adding it on first create.
+  - The 0.39 prod `messages` drift (missing `createdAt`, then `id` "Cannot be blank" after a raw field PATCH) came from schema mismatch during the bump. When migrating 0.25→0.39, reconcile the schema scripts against 0.39's field semantics (incl. system `id` `autogeneratePattern`) instead of patching collections by hand.
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 1d7013b..7faa80a 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -35,7 +35,7 @@ COPY --from=builder /app/proxy/dist ./proxy
 COPY docker/nginx.conf /etc/nginx/http.d/default.conf
 COPY docker/entrypoint.sh /entrypoint.sh
 
-ARG POCKETBASE_VERSION=0.39.10
+ARG POCKETBASE_VERSION=0.25.8
 
 RUN wget -qO /tmp/pb.zip \
     "https://github.com/pocketbase/pocketbase/releases/download/v${POCKETBASE_VERSION}/pocketbase_${POCKETBASE_VERSION}_linux_amd64.zip" \