Delete row sig_c3b75be45180 from signals

id sig_c3b75be45180
event_id evt_846765edeb7e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T00:32:14.045081+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:283857f338f9159f
throttle_s 0
created_at 2026-04-22T00:32:14.045081+00:00
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