Delete row sig_ddba78936afd from signals

id sig_ddba78936afd
event_id evt_41b8c5ea2181
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T11:57:06.734613+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:27689c17e30c7223
throttle_s 0
created_at 2026-04-22T11:57:06.734613+00:00
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