Delete row sig_fc7ba80fd851 from signals

id sig_fc7ba80fd851
event_id evt_be75c3f46bf9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T18:56:13.154825+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9523881236018ab0
throttle_s 0
created_at 2026-04-12T18:56:13.154825+00:00
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