Delete row sig_2f76c345c856 from signals

id sig_2f76c345c856
event_id evt_9d4e7c319f6e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T10:55:13.067339+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7a505a16abc991d8
throttle_s 0
created_at 2026-04-19T10:55:13.067339+00:00
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