Delete row sig_6fce415132d9 from signals

id sig_6fce415132d9
event_id evt_b55b34ce813e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5680143 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:23:08Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-21T20:23:08.832280+00:00
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