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/prompts/overrides.py

@@ -0,0 +1,55 @@
+"""The effective system prompts, as the process sees them.
+
+Prompts default to code (`app/prompts/defaults.py`); an admin may override any
+of them in `prompt_settings`, applied without a restart. This mirrors the LLM
+settings override pattern, with two simplifications: the reset target is the
+code default (prompts have no `.env` layer), and there is no bootstrap — a
+missing row simply means "use the default".
+
+`get_prompt` is called while rendering a prompt, so it reads a module-level
+cache rather than awaiting a query. The cache is filled at startup and refreshed
+on every admin write. Single-process by design (`--workers 1`); a multi-worker
+deployment would need a notification channel.
+"""
+
+import logging
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models import PromptSetting
+from app.prompts.defaults import DEFAULTS
+
+logger = logging.getLogger("pablan.prompts")
+
+# Only holds the keys an admin has actually overridden.
+_config: dict[str, str] = {}
+
+
+async def load_config(db: AsyncSession) -> None:
+    """Re-read every override row into the cache. Call at startup and after any
+    admin write."""
+    rows = (await db.execute(select(PromptSetting))).scalars().all()
+    _config.clear()
+    _config.update({row.key: row.content for row in rows if row.key in DEFAULTS})
+    logger.info(
+        "prompt settings loaded",
+        extra={"event": "prompt_settings_loaded", "overridden": sorted(_config)},
+    )
+
+
+def get_prompt(key: str) -> str:
+    """The effective prompt: an admin override if present, else the code default.
+
+    `key` must be a known prompt (a `KeyError` here is a programming error, not
+    user input)."""
+    return _config.get(key) or DEFAULTS[key]
+
+
+def is_overridden(key: str) -> bool:
+    return key in _config
+
+
+def clear() -> None:
+    """Drop the cache — used by tests between cases."""
+    _config.clear()