Delete row sig_dd788342f63a from signals

id sig_dd788342f63a
event_id evt_dc9ae5a3018b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T09:31:31.545725+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cdd8905885058d89
throttle_s 0
created_at 2026-04-18T09:31:31.545725+00:00
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