Delete row sig_2677298ba8ba from signals

id sig_2677298ba8ba
event_id evt_aac65f209c08
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T10:54:52.773566+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:4a70d731ff9afe38
throttle_s 0
created_at 2026-04-19T10:54:52.773566+00:00
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