Delete row sig_419bc5f8ff51 from signals

id sig_419bc5f8ff51
event_id evt_60eff78312f9
watcher_id NULL
signal_type macro_prices_snapshot
value {"as_of":"2026-04-11T00:55:46.754867+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source macro_ingestor
reason_trace {}
dedupe_key macro_prices_snapshot:ecdafb9ed287e6d9
throttle_s 0
created_at 2026-04-11T00:55:46.749139+00:00
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