Delete row sig_508a21795a9d from signals

id sig_508a21795a9d
event_id evt_b241fbd08312
watcher_id NULL
signal_type macro_prices_snapshot
value {"as_of":"2026-04-16T07:26:02.260572+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source macro_ingestor
reason_trace {}
dedupe_key macro_prices_snapshot:8f910bc88e3d0446
throttle_s 0
created_at 2026-04-16T07:26:02.248960+00:00
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