Delete row sig_a6bb7865e48d from signals

id sig_a6bb7865e48d
event_id evt_38d6f390c575
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T19:36:08.302307+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:59df5dbb368986a7
throttle_s 0
created_at 2026-04-10T19:36:08.302307+00:00
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