Delete row sig_51b5c451e885 from signals

id sig_51b5c451e885
event_id evt_a38510b1e7d0
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T10:02:52.509735+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:abf959420488ce7f
throttle_s 0
created_at 2026-04-18T10:02:52.509735+00:00
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