Delete row sig_b65134fd9a75 from signals

id sig_b65134fd9a75
event_id evt_a25549ac64a5
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T22:00:05.287536+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8012b1072f0d442d
throttle_s 0
created_at 2026-04-21T22:00:05.287536+00:00
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