Delete row sig_4bff016a26d0 from signals

id sig_4bff016a26d0
event_id evt_6247f072972d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T12:12:13.261255+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:56a78ac0edcac183
throttle_s 0
created_at 2026-04-15T12:12:13.261255+00:00
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