Delete row sig_d4d900f6850f from signals

id sig_d4d900f6850f
event_id evt_e5040c19f713
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-03T10:35:47.669357+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e5ae41e855e4f909
throttle_s 0
created_at 2026-04-03T10:35:47.669357+00:00
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