Delete row sig_df963cc505ce from signals

id sig_df963cc505ce
event_id evt_147fc20cae27
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T06:21:35.973715+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:5a10c6aeee2b7c19
throttle_s 0
created_at 2026-04-18T06:21:35.973715+00:00
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