Delete row sig_d542093cc1cc from signals

id sig_d542093cc1cc
event_id evt_511ad77157a8
watcher_id NULL
signal_type discovery_sec_filings_snapshot
value {"as_of":"2026-04-21T12:20:48.730437+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {}
dedupe_key discovery_sec_filings_snapshot:6efce53b05fd5922
throttle_s 0
created_at 2026-04-21T12:20:48.730437+00:00
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