Delete row sig_4bdc6e7bff33 from signals

id sig_4bdc6e7bff33
event_id evt_89ae1df353b6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T12:25:15.522381+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7a337f2637a09538
throttle_s 0
created_at 2026-04-19T12:25:15.522381+00:00
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