Delete row sig_68b1f19806c7 from signals

id sig_68b1f19806c7
event_id evt_2f138bdd8ed4
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":316,"confidence":0.8208336 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T01:19:47Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-16T01:19:47.067810+00:00
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