Delete row sig_a40fbc060173 from signals

id sig_a40fbc060173
event_id evt_19bca0e47ae4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T02:47:35.937389+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e57abb6b56955b30
throttle_s 0
created_at 2026-04-12T02:47:35.937389+00:00
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