Delete row sig_3bec5ad68862 from signals

id sig_3bec5ad68862
event_id evt_60f7ea8a2f59
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T22:11:15.070878+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:84571c0ac20bc509
throttle_s 0
created_at 2026-04-19T22:11:15.070878+00:00
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