Delete row sig_46822eaf89be from signals

id sig_46822eaf89be
event_id evt_afbbe988af19
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T21:56:31.193650+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:27c1c19ad3f455c8
throttle_s 0
created_at 2026-04-12T21:56:31.193650+00:00
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