Delete row sig_537741f3949a from signals

id sig_537741f3949a
event_id evt_13487c7e41d2
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5575532 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:30:06Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T20:30:06.903121+00:00
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