POST /prompt_manager/system/library/move starts "Move library", an
exclusive, non-cancellable job (database/library_move.py). It checks the
target volume's free space, copies the database with SQLite's backup API
from one read snapshot, verifies the copy (integrity check, every workflow
document, the same rows in every table), copies the safety and
pre-migration backups and config.json (owner-only, checked by size and
SHA-256), then publishes under the old file's write lock and switches the
live process (every PromptModel, the review and history observers, the
API's plans and health report). The old prompts.db and config.json are
renamed *.moved-to-<folder> only after the switch. A failure removes
everything it wrote and leaves the old library in use; a marker in the new
folder makes a restart after any crash pick the right library.
GET /prompt_manager/system/library and the Overview's "location" say where
the library lives and why; POST .../keep persists "Keep it here".
utils/library_location.py decides where the library lives: the
PROMPT_MANAGER_DATA_DIR folder (validated: absolute, never inside a folder
ComfyUI or Prompt Manager serves), an explicit database.default_path as
before, a node-folder library that was not moved, else ComfyUI's
user/__promptmanager. The database, diagnostics, config.json, logs and the
LoRA image cache all ask it, so a new install never writes into the node
folder and an existing one keeps every path until the user moves it.
"Keep it here" is persisted as library.keep_in_node_folder.
Vito Sansevero