Delete row sig_3ca4df1286fe from signals

id sig_3ca4df1286fe
event_id evt_ed807adf2ea4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T07:45:33.995657+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:72d97978dcab8993
throttle_s 0
created_at 2026-04-18T07:45:33.995657+00:00
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