database removed outside

README.md

@@ -23,3 +23,25 @@ PDK component assets and `technology.yml` manifests are loaded from the same
 role-scoped PDK roots. Normal users and developers use
 `MXPIC_PDK_PUBLIC_ROOT` or `../opt_pdk_public/foundries`; managers use
 `MXPIC_PDK_ATLAS_ROOT` or `../opt_pdk_atlas/foundries`.
+
+## Runtime Database Root
+
+Runtime data is not stored inside this repository. Move the existing `database`
+folder beside `mxpic_EDA` and rename it:
+
+```text
+mxpic_EDA_database
+```
+
+Default runtime data path:
+
+```text
+../mxpic_EDA_database
+```
+
+The app fails fast if this folder is missing so debugging cannot silently create
+or modify tracked database files. For nonstandard deployments, set:
+
+```text
+MXPIC_DATABASE_ROOT=<path-to-mxpic_EDA_database>
+```