if you built memory across sessions for your local setup, how would you store it?

curious how people here would do this.

say you want the useful stuff (decisions, project terms, preferences) to carry over between sessions and tools, without dumping whole chat logs back in.

• plain text summaries, embeddings, or a mix?
• keep it local or sync it?
• how do you deal with old facts that are wrong now?

not selling anything, just want to hear what tradeoffs people actually ran into.