Delete row sig_19156dc560ad from signals

id sig_19156dc560ad
event_id evt_09b696a1be5a
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-17T12:22:06.590622+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:d87a56c3ec54b43d
throttle_s 0
created_at 2026-04-17T12:22:06.590622+00:00
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