Delete row sig_43a501414ec4 from signals

id sig_43a501414ec4
event_id evt_40972fc13e4e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T00:22:06.702802+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b33b06faa683b8d4
throttle_s 0
created_at 2026-04-22T00:22:06.702802+00:00
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