Delete row sig_45a0961bd4ca from signals

id sig_45a0961bd4ca
event_id evt_0ba7cb152c0d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T22:32:27.414885+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:91252f2ae2d8a5ba
throttle_s 0
created_at 2026-04-19T22:32:27.414885+00:00
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