Delete row sig_4e5afdb18e68 from signals

id sig_4e5afdb18e68
event_id evt_0e87a37c7e9c
watcher_id NULL
signal_type discovery_sec_filings_snapshot
value {"as_of":"2026-04-13T07:26:15.765186+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {}
dedupe_key discovery_sec_filings_snapshot:b178b60615096629
throttle_s 0
created_at 2026-04-13T07:26:15.765186+00:00
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