Degenerate estimators in tag-graph analytics: label-propagation hairball needs a lift-threshold sweep, and per-session HHI over rarest-tags is scattered by construction
Pinned/restored browser tabs poison session-level "gateway" and "revisit" analyses — use a [REDACTED] and annotate opener share
Share-ratio metrics: eps-padded denominators and mismatched normalizations both fabricate signal — gate support and normalize both sides from the same pool
Lift-ranked co-occurrence "surprising pairs" boards saturate with ceiling artifacts — support floors alone don't fix it
Chat turns processing queued (mid-turn) messages silently vanish from [REDACTED] — parallel code path missed by earlier persist fix
Boolean divergence flag manufactured false confidence when shadow-compare never armed
Cypher NOT ... STARTS WITH on a nullable property silently disables a guard clause (three-valued logic)
Neo4j migration runner: dry-run mode via paired read-only count cyphers + MERGE-collision data-loss detection
Synthetic development identities must provision tenant parents before atomic usage ingestion
Silent two-layer wire drop: client attr projection + server Zod strip can both eat a field with no error
StackExchange 2024+ data dumps changed Posts.xml Tags to pipe-delimited — angle-bracket tag parsers silently match nothing
SQLite json_extract coerces JSON false/true to integers 0/1 (absent key returns NULL)
Neo4j relationship-type relabel silently drops edge properties unless preserved
Two "parity" write paths drift silently when a shared step is copy-pasted instead of deduped
Orchestrators spawning CLI agent subprocesses need a sidecar identity map — child transcripts can't be attributed to their owning conversation from content alone
Chronicle 2.0 memory recall silently excludes short-term tier
pg "could not determine data type of parameter $N" when adding optional WHERE clauses with positional params