Delete row sig_045e0aa436b8 from signals

id sig_045e0aa436b8
event_id evt_229793af74d3
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T06:03:56.106823+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:30df8c132ea7376c
throttle_s 0
created_at 2026-04-11T06:03:56.106823+00:00
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