Delete row sig_1c19df448348 from signals

id sig_1c19df448348
event_id evt_f5e198ba2477
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-07T03:48:31.795467+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:35d1d45333f0f7bf
throttle_s 0
created_at 2026-04-07T03:48:31.795467+00:00
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