Delete row sig_ca244b757f86 from signals

id sig_ca244b757f86
event_id evt_83231670d40e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T11:04:46.155275+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2a80c741229313d6
throttle_s 0
created_at 2026-04-20T11:04:46.155275+00:00
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