anti 119b4e8724 feat(db): add session_profile table for keystroke-dynamics fingerprints ...

New purpose-built table with schema_version column committed from day one
so V2 federation gossip can cluster sessions across operators without
retrofitting. Ships with the empty write path (upsert_session_profile);
ingestion of keystroke features (IKI moments, control-char rates, digraph
SimHash) is tracked as V2 work.

Closes gap #2 from SIGNAL_CAPTURE_AUDIT.md.

2026-04-22 21:39:17 -04:00

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