Delete row sig_ec7b99aec398 from signals

id sig_ec7b99aec398
event_id evt_3a77d8002134
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-16T08:06:25.800999+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8aef9ef4c2fd245c
throttle_s 0
created_at 2026-04-16T08:06:25.800999+00:00
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