Delete row sig_02123712a66f from signals

id sig_02123712a66f
event_id evt_1f835c8400de
watcher_id NULL
signal_type discovery_sec_filings_snapshot
value {"as_of":"2026-04-14T08:09:17.079656+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {}
dedupe_key discovery_sec_filings_snapshot:ad4058b1aec189bd
throttle_s 0
created_at 2026-04-14T08:09:17.079656+00:00
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