Delete row sig_fbac507c9df1 from signals

id sig_fbac507c9df1
event_id evt_ee14304fc486
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T13:31:28.626090+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:62a43fcafd69ce7d
throttle_s 0
created_at 2026-04-19T13:31:28.626090+00:00
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