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c5d1bd1360
We switched all model paths to be absolute in #5900. In hindsight, this is a mistake, because it makes the `models_dir` non-portable. This change reverts to the previous model pathing: - Invoke-managed models (in the `models_dir`) are stored with relative paths - Non-invoke-managed models (outside the `models_dir`, i.e. in-place installed models) still have absolute paths. ## Why absolute paths make things non-portable Let's say my `models_dir` is `/media/rhino/invokeai/models/`. In the DB, all model paths will be absolute children of this path, like this: - `/media/rhino/invokeai/models/sd-1/main/model1.ckpt` I want to change my `models_dir` to `/home/bat/invokeai/models/`. I update my `invokeai.yaml` file and physically move the files to that directory. On startup, the app checks for missing models. Because all of my model paths were absolute, they now point to a nonexistent path. All models are broken. There are a couple options to recover from this situation, neither of which are reasonable: 1. The user must manually update every model's path. Unacceptable UX. 2. On startup, we check for missing models. For each missing model, we compare its path with the last-known models dir. If there is a match, we replace that portion of the path with the new models dir. Then we re-check to see if the path exists. If it does, we update the models DB entry. Brittle and requires a new DB entry for last-known models dir. It's better to use relative paths for Invoke-managed models.