Delete row sig_a465b4a6e8bb from signals

id sig_a465b4a6e8bb
event_id evt_5f8c6d447025
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T00:50:42.574413+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:89e59cb9a1fedbab
throttle_s 0
created_at 2026-04-20T00:50:42.574413+00:00
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