Delete row sig_acb6b522fa89 from signals

id sig_acb6b522fa89
event_id evt_bcba9fa09438
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T10:17:11.346649+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f81e16300716b7fe
throttle_s 0
created_at 2026-04-19T10:17:11.346649+00:00
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