Delete row sig_bb2369503f75 from signals

id sig_bb2369503f75
event_id evt_5baab5f8ac8d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T18:00:45.311998+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:14ecd345a1459e7e
throttle_s 0
created_at 2026-04-19T18:00:45.311998+00:00
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