Delete row sig_818a8386a3ca from signals

id sig_818a8386a3ca
event_id evt_0e9765d5bdf8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T13:26:15.931997+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:90e2b3178ce91fd0
throttle_s 0
created_at 2026-04-22T13:26:15.931997+00:00
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