Delete row sig_f1bfe47b54f5 from signals

id sig_f1bfe47b54f5
event_id evt_54b29be1f04e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T10:57:16.778067+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fa36d04372877101
throttle_s 0
created_at 2026-04-18T10:57:16.778067+00:00
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