Delete row sig_f1a52cd45c81 from signals

id sig_f1a52cd45c81
event_id evt_53ee04399945
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T05:50:35.007384+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:41e722f9a65135cb
throttle_s 0
created_at 2026-04-20T05:50:35.007384+00:00
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