Delete row sig_3a9e929edd65 from signals

id sig_3a9e929edd65
event_id evt_2156067d5343
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T22:00:42.376634+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d049da93d7412d31
throttle_s 0
created_at 2026-04-17T22:00:42.376634+00:00
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