Delete row sig_01e78e711132 from signals

id sig_01e78e711132
event_id evt_35cdc0929270
watcher_id NULL
signal_type macro_prices_snapshot
value {"as_of":"2026-04-15T00:04:02.193250+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source macro_ingestor
reason_trace {}
dedupe_key macro_prices_snapshot:f0cd2685742838c2
throttle_s 0
created_at 2026-04-15T00:04:01.933123+00:00
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