Delete row sig_e999587cb2cb from signals

id sig_e999587cb2cb
event_id evt_40a367be5313
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T01:14:15.654279+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:de5700f7a55dbe2d
throttle_s 0
created_at 2026-04-21T01:14:15.654279+00:00
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