scale-canarylisted

# Scale Canary (Performance & Resource Allocation Audit) <!-- SHARED:LANGUAGE_HEADER --> Audit code for scalability issues, performance bottlenecks, and resource leaks. ## Auditing Categories 1. **O(N^2) Complexity** — Nested loops over growable collections without indexing or caching (causes performance crashes at scale). 2. **N+1 Database Queries** — Querying database records in a loop instead of performing a batch JOIN or using bulk prefetching. 3. **Memory Bloat / Leaks** — Appending data to global arrays or maps without clearing them, leading to unbounded memory growth. 4. **Blocking Main Loop** — Performing synchronous file system operations or CPU-heavy calculations in the main event thread (causes lag/hangs). 5. **Resource Leakage** — Leaving streams, connections, or file handles open without closing them inside a `finally` block. Per-ORM N+1 shapes, per-stack blocking patterns, and scoping rules (what NOT to flag): read `references/checks.md` before scanning. ## Fix mode (choice-gated) In Agent Context, after the audit report, present via `ask_question`: - **Apply safe optimizations:** Replace synchronous file operations with asynchronous ones, and insert `finally` blocks for stream closing. - **Let me pick:** Allow the user to select specific optimizations. - **Report only:** Exit without making changes. ## Output `| file:line | bottleneck | severity | finding | optimization plan |` Severity: CRITICAL (O(N^2) on user-facing API / unclosed file handles) · HI