Delete row sig_a1c795244cd8 from signals

id sig_a1c795244cd8
event_id evt_c4a29b10fe21
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T08:47:55.435510+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3c2fdec529f35073
throttle_s 0
created_at 2026-04-09T08:47:55.435510+00:00
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