Delete row sig_881a71a47ee7 from signals

id sig_881a71a47ee7
event_id evt_62ebeea699a5
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T00:02:32.474617+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:65838039bf7817d1
throttle_s 0
created_at 2026-04-19T00:02:32.474617+00:00
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