Delete row sig_dda81c80df79 from signals

id sig_dda81c80df79
event_id evt_0f44dea41e1e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T16:47:41.845538+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c38e0c271e05299e
throttle_s 0
created_at 2026-04-12T16:47:41.845538+00:00
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