Delete row sig_280284e39ace from signals

id sig_280284e39ace
event_id evt_4dba7e3cd0e6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T11:47:45.380119+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1c04383188dc21a8
throttle_s 0
created_at 2026-04-12T11:47:45.380119+00:00
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