Delete row sig_d449781828ea from signals

id sig_d449781828ea
event_id evt_687bf5396763
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T22:31:29.378686+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:2b4f41d5f4d95736
throttle_s 0
created_at 2026-04-11T22:31:29.378686+00:00
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