Delete row sig_e555daca575e from signals

id sig_e555daca575e
event_id evt_e15491ef3b15
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T07:23:52.128951+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:760f697056cafef2
throttle_s 0
created_at 2026-04-21T07:23:52.128951+00:00
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