Delete row sig_90992f37449f from signals

id sig_90992f37449f
event_id evt_e409f907c88e
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-17T15:11:39.944413+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:5a1bf71792574551
throttle_s 0
created_at 2026-04-17T15:11:39.944413+00:00
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