Delete row sig_5056c618d2f7 from signals

id sig_5056c618d2f7
event_id evt_27750062bbb0
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T17:02:00.304978+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:7f276d60abcb0cba
throttle_s 0
created_at 2026-04-12T17:02:00.304978+00:00
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