Delete row sig_19afe2427188 from signals

id sig_19afe2427188
event_id evt_7929ac894f06
watcher_id NULL
signal_type discovery_sec_filings_snapshot
value {"as_of":"2026-04-22T15:21:13.336058+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {}
dedupe_key discovery_sec_filings_snapshot:582c9b1d9a662a9a
throttle_s 0
created_at 2026-04-22T15:21:13.336058+00:00
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