Delete row sig_5748b4272473 from signals

id sig_5748b4272473
event_id evt_e7aedf3f7fd6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T01:17:03.448074+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:400c17eff66c099c
throttle_s 0
created_at 2026-04-18T01:17:03.448074+00:00
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