Delete row sig_02e6491dc283 from signals

id sig_02e6491dc283
event_id evt_2078046be841
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5794378 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T03:42:26Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T03:42:26.961152+00:00
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