Delete row sig_ac921493681e from signals

id sig_ac921493681e
event_id evt_b2a1c9221b03
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T22:22:26.440304+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5fd1c6983020c9a4
throttle_s 0
created_at 2026-04-21T22:22:26.440304+00:00
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