Delete row sig_910a475a0414 from signals

id sig_910a475a0414
event_id evt_1c99aa54688a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T21:03:35.312179+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9696b81b25d0428d
throttle_s 0
created_at 2026-04-12T21:03:35.312179+00:00
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