Delete row sig_0c3d7a31aa9f from signals

id sig_0c3d7a31aa9f
event_id evt_a170159fcafa
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T16:31:02.318572+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6026c7648b9d3313
throttle_s 0
created_at 2026-04-19T16:31:02.318572+00:00
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