Delete row sig_461d208691d8 from signals

id sig_461d208691d8
event_id evt_e380603f7cae
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T14:31:19.453481+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:eb6202170d91b721
throttle_s 0
created_at 2026-04-18T14:31:19.453481+00:00
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