Delete row sig_dcc4e636d064 from signals

id sig_dcc4e636d064
event_id evt_89465a294924
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T03:42:52.143884+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6289c0c7d9b8384b
throttle_s 0
created_at 2026-04-09T03:42:52.143884+00:00
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