Delete row sig_e4757fd5b857 from signals

id sig_e4757fd5b857
event_id evt_af81444aed67
watcher_id NULL
signal_type macro_prices_snapshot
value {"as_of":"2026-04-09T06:55:02.859737+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source macro_ingestor
reason_trace {}
dedupe_key macro_prices_snapshot:79ffc2ee8c7e438f
throttle_s 0
created_at 2026-04-09T06:55:02.849170+00:00
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