Delete row sig_6070b4d77691 from signals

id sig_6070b4d77691
event_id evt_a67ec59695a5
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T11:23:36.066431+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:f1373a432d617df9
throttle_s 0
created_at 2026-04-11T11:23:36.066431+00:00
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