Delete row sig_8b0619bbe46f from signals

id sig_8b0619bbe46f
event_id evt_75ec16661abb
watcher_id NULL
signal_type discovery_sec_filings_snapshot
value {"as_of":"2026-04-12T06:42:42.365074+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {}
dedupe_key discovery_sec_filings_snapshot:306b74fdd066d8f6
throttle_s 0
created_at 2026-04-12T06:42:42.365074+00:00
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