Delete row sig_5ee949c5737a from signals

id sig_5ee949c5737a
event_id evt_150005fc588e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T09:15:47.156234+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8452b9a452fced59
throttle_s 0
created_at 2026-04-20T09:15:47.156234+00:00
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