feat: ROUNDTABLE_* env vars with FABLEDSCRYER_* fallback

Reads ROUNDTABLE_<NAME> first, falls back to FABLEDSCRYER_<NAME> so
existing deployments keep working through the rebrand transition.
Covers DATABASE_URL, DATABASE__URL, SECRET_KEY, PLUGIN_DIR, CONFIG.

roundtable/config.py

@@ -11,6 +11,17 @@ logger = logging.getLogger(__name__)
 _SECRET_KEY_FILE = Path("/data/secret.key")
 
 
+def _env(suffix: str) -> str | None:
+    """Read ROUNDTABLE_<suffix>, falling back to FABLEDSCRYER_<suffix>.
+
+    Allows existing deployments to keep their old env vars working through
+    the rebrand transition. Remove the fallback once users have migrated.
+    """
+    return os.environ.get(f"ROUNDTABLE_{suffix}") or os.environ.get(
+        f"FABLEDSCRYER_{suffix}"
+    )
+
+
 def load_bootstrap(config_path: Path | str | None = None) -> dict[str, str]:
     """Return the minimum bootstrap config: database_url and secret_key.
 
@@ -33,19 +44,19 @@ def load_bootstrap(config_path: Path | str | None = None) -> dict[str, str]:
             raw = yaml.safe_load(f) or {}
 
     database_url = (
-        os.environ.get("FABLEDSCRYER_DATABASE_URL")
-        or os.environ.get("FABLEDSCRYER_DATABASE__URL")
+        _env("DATABASE_URL")
+        or _env("DATABASE__URL")
         or raw.get("database", {}).get("url")
     )
     if not database_url:
         raise ValueError(
-            "Database URL is required. Set FABLEDSCRYER_DATABASE_URL env var "
+            "Database URL is required. Set ROUNDTABLE_DATABASE_URL env var "
             "or add 'database.url' to config.yaml."
         )
 
     secret_key = _resolve_secret_key(raw)
     plugin_dir = (
-        os.environ.get("FABLEDSCRYER_PLUGIN_DIR")
+        _env("PLUGIN_DIR")
         or raw.get("plugin_dir", "plugins")
     )
 
@@ -58,7 +69,7 @@ def load_bootstrap(config_path: Path | str | None = None) -> dict[str, str]:
 
 def _resolve_secret_key(raw: dict) -> str:
     """Resolve secret_key: env var → file → auto-generate."""
-    from_env = os.environ.get("FABLEDSCRYER_SECRET_KEY") or raw.get("secret_key")
+    from_env = _env("SECRET_KEY") or raw.get("secret_key")
     if from_env:
         return from_env
 

roundtable/migrations/env.py

@@ -16,18 +16,20 @@ target_metadata = Base.metadata
 
 def get_url() -> str:
     import os, yaml
-    cfg_path = os.environ.get("FABLEDSCRYER_CONFIG", "config.yaml")
+
+    def _env(suffix: str) -> str | None:
+        return os.environ.get(f"ROUNDTABLE_{suffix}") or os.environ.get(
+            f"FABLEDSCRYER_{suffix}"
+        )
+
+    cfg_path = _env("CONFIG") or "config.yaml"
     try:
         with open(cfg_path) as f:
             cfg = yaml.safe_load(f) or {}
         url = cfg.get("database", {}).get("url", "")
     except FileNotFoundError:
         url = ""
-    return (
-        os.environ.get("FABLEDSCRYER_DATABASE_URL")
-        or os.environ.get("FABLEDSCRYER_DATABASE__URL")
-        or url
-    )
+    return _env("DATABASE_URL") or _env("DATABASE__URL") or url
 
 
 def _resolved_url() -> str: