Delete row sig_c44b46a53ed4 from signals

id sig_c44b46a53ed4
event_id evt_f23db5a0187a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T15:13:34.922357+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f553c193a6713a2e
throttle_s 0
created_at 2026-04-10T15:13:34.922357+00:00
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