Delete row sig_8c298048e4bd from signals

id sig_8c298048e4bd
event_id evt_c426c794e0e4
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.8315010 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:30:06Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:A ...
throttle_s 0
created_at 2026-04-08T20:30:06.903121+00:00
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