Delete row sig_ffdf05a9a636 from signals

id sig_ffdf05a9a636
event_id evt_04fe61bfc342
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-06T23:19:07.882094+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8d42dfe194448069
throttle_s 0
created_at 2026-04-06T23:19:07.882094+00:00
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