A practitioner writes: “Whenever negative energy signatures are healed in the akashic records, especially all through time, do we lose the lessons learned when making a record of the original event to have never taken place?”

You will not lose the lesson. The removal of a negative energetic signature, within the akashic record of a trauma event, will neutralize its karmic implications and impact and will leave anything beneficial. So the knowledge itself, gained from the life experience as well as an ultimate lesson of something having been tried but failed, will be retained. The overall meaning of all that has happened will still be on record and accessible to the person for their ongoing learning and growth. What is extracted by the healing is a continued potential of negative energy, stored as the energetic signature, to create trouble over and over again on a chronic basis because it is serving karma as a reminder of something thrown out of balance. When that is set right by healing, that negative energetic consequence is taken away, so the hard-won learning remains but the painful consequence is removed, so what is left is the facts of the matter, but devoid of pain and suffering that can continue to rumble and harm a person again and again.