Pablan, as it stands

Self-hosted knowledge management for SMEs: a split-screen Markdown editor
whose sections an LLM refines while you write, and RAG question answering
over the documents that result. FastAPI + Postgres/pgvector on the back,
SvelteKit on the front, everything OpenAI-compatible and self-hostable.

Squashed into a single commit; the development history stays local.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CA43ZJda8Rbp2hKXNy8f6b

backend/app/models/llm_setting.py

@@ -0,0 +1,36 @@
+from sqlalchemy import Boolean, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
+
+
+class LLMSetting(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    """Per-role endpoint configuration, edited in the admin UI.
+
+    One row per model role. The rows are created once, at first start, from
+    the `PABLAN_CHAT_*` / `PABLAN_UTILITY_*` / `PABLAN_EMBEDDING_*` environment
+    variables; from then on **this table is the truth** and later `.env`
+    edits are ignored (see docs/architecture.md, "bootstrap, then DB").
+
+    The `*_from_env` flags record where each field's current value came
+    from, so the UI can say "taken from .env" or "changed here" per field
+    and offer a reset. They are not a fallback mechanism: the value itself
+    always lives in the column next to them. Tracking the provenance
+    explicitly beats comparing against the current environment, which would
+    mislabel every field the moment someone edits `.env` after bootstrap.
+
+    The api_key is stored in plaintext because it has to be replayed to the
+    endpoint on every call — there is nothing to compare a hash against.
+    It is never returned by the API and never logged.
+    """
+
+    __tablename__ = "llm_settings"
+
+    role: Mapped[str] = mapped_column(String(32), unique=True)
+    base_url: Mapped[str | None] = mapped_column(String(500))
+    model: Mapped[str | None] = mapped_column(String(200))
+    api_key: Mapped[str | None] = mapped_column(Text)
+
+    base_url_from_env: Mapped[bool] = mapped_column(Boolean, default=True)
+    model_from_env: Mapped[bool] = mapped_column(Boolean, default=True)
+    api_key_from_env: Mapped[bool] = mapped_column(Boolean, default=True)