Custom prompts saved via the Settings -> Prompts UI are persisted to the
database, but every assistant and flow session creation path was using
templates.NewDefaultPrompter() with a leftover TODO, so user overrides
never reached the agents and Langfuse traces always showed the defaults.
Add a controller-side helper that loads the user's saved prompts and
overlays them on the compiled defaults. Prompt types the user has not
customized continue to use the defaults; an empty body row is treated
as no override (the UI uses delete to reset). A database error fails
session creation explicitly instead of silently falling back.
Wire the helper into the four affected call sites in NewAssistantWorker,
LoadAssistantWorker, NewFlowWorker, and LoadFlowWorker.
Closes#300
Signed-off-by: mason5052 <ehehwnwjs5052@gmail.com>
Adds conditional chain normalization in processChain to preserve reasoning cache when provider unchanged while fixing incomplete tool_calls and converting IDs when switching providers. Extends GraphQL API with modelProvider parameter for seamless provider changes without restart.
mason5052