Delete row sig_a73bfde8e7a5 from signals

id sig_a73bfde8e7a5
event_id evt_be645ab4b801
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T10:23:23.306276+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:04c6fde73b7186b9
throttle_s 0
created_at 2026-04-16T10:23:23.306276+00:00
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