Delete row sig_f37d801c8dbe from signals

id sig_f37d801c8dbe
event_id evt_2b1e9e8e1987
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":427,"confidence":0.5812208 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-11T20:01:25Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-14T20:01:25.430832+00:00
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