Delete row sig_b2917f204e99 from signals

id sig_b2917f204e99
event_id evt_2a0946038b2a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T19:30:51.500426+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:7e4c486a35311598
throttle_s 0
created_at 2026-04-11T19:30:51.500426+00:00
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