Delete row sig_dffc73dfd5c2 from signals

id sig_dffc73dfd5c2
event_id evt_dd9b66ea0463
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T22:45:20.005261+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a3b88a7fdfd27b62
throttle_s 0
created_at 2026-04-11T22:45:20.005261+00:00
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