Delete row sig_f784f17a1c5d from signals

id sig_f784f17a1c5d
event_id evt_be9c29c17f32
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T14:15:19.136535+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:7e4c137d2f8f78ce
throttle_s 0
created_at 2026-04-22T14:15:19.136535+00:00
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