Delete row sig_7eddc72e854d from signals

id sig_7eddc72e854d
event_id evt_c78548d0b893
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T13:20:38.424425+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5db8e594782b7622
throttle_s 0
created_at 2026-04-16T13:20:38.424425+00:00
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