Delete row sig_ba8ec51abe88 from signals

id sig_ba8ec51abe88
event_id evt_57fbf8d2ac0a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T18:01:22.723228+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:301c44e1f762b872
throttle_s 0
created_at 2026-04-11T18:01:22.723228+00:00
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