GHSA-9rwj-6rc7-p77c: LangGraph's SQLite is vulnerable to SQL injection via metadata filter key in SQLite checkpointer list method

# Context A SQL injection vulnerability exists in LangGraph's SQLite checkpoint implementation that allows attackers to manipulate SQL queries through metadata filter keys. This affects applications that accept **untrusted metadata filter keys** (not just filter values) in checkpoint search operations. # Impact Attackers who control metadata filter keys can execute arbitrary sql queries against the database. # Root Cause The `_metadata_predicate()` function constructs SQL queries by interpolating filter keys directly into f-strings without validation: ```python # VULNERABLE CODE (before fix) …