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**Issue #654 (critical):** handleRequest() returned HTTP 400 for JSON-RPC notifications with stale/expired session IDs. Per JSON-RPC 2.0 spec, notifications don't expect responses. Returning 400 caused Claude's proxy to interpret the connection as broken, triggering reconnection storms (930 errors/day, 216 users affected). Fix: Added isJsonRpcNotification() helper that detects single and batch notifications (messages with method but no id field). Path C in handleRequest() now returns 202 Accepted for notifications with stale sessions instead of 400. Also added TOCTOU null guard in Path B. **Issue 1 (medium):** updateTable silently accepted columns parameter via the shared MCP tool schema. Zod stripped it but gave no feedback. Fix: handleUpdateTable now detects columns in raw args and appends a warning to the response. Tool schema descriptions clarified that columns are for createTable only and schema is immutable after creation. Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>