Add option to drop extension db at un-install time or later (#1746)

* chore: remove un-used file
* feat: allow extension DB clean-up
* feat: i18n and bundle update
* chore: code format
* fix: button color
* chore: delete temp file
* chore: fix merge conflicts
* chore: add extra log
* chore: bump CACHE_VERSION to `37`

lnbits/core/crud.py

@@ -7,7 +7,7 @@ from uuid import UUID, uuid4
 import shortuuid
 
 from lnbits import bolt11
-from lnbits.db import Connection, Filters, Page
+from lnbits.db import Connection, Database, Filters, Page
 from lnbits.extension_manager import InstallableExtension
 from lnbits.settings import AdminSettings, EditableSettings, SuperSettings, settings
 
@@ -142,6 +142,25 @@ async def delete_installed_extension(
     )
 
 
+async def drop_extension_db(*, ext_id: str, conn: Optional[Connection] = None) -> None:
+    db_version = await (conn or db).fetchone(
+        "SELECT * FROM dbversions WHERE db = ?", (ext_id,)
+    )
+    # Check that 'ext_id' is a valid extension id and not a malicious string
+    assert db_version, f"Extension '{ext_id}' db version cannot be found"
+
+    is_file_based_db = await Database.clean_ext_db_files(ext_id)
+    if is_file_based_db:
+        return
+
+    # String formatting is required, params are not accepted for 'DROP SCHEMA'.
+    # The `ext_id` value is verified above.
+    await (conn or db).execute(
+        f"DROP SCHEMA IF EXISTS {ext_id} CASCADE",
+        (),
+    )
+
+
 async def get_installed_extension(ext_id: str, conn: Optional[Connection] = None):
     row = await (conn or db).fetchone(
         "SELECT * FROM installed_extensions WHERE id = ?",
@@ -781,6 +800,15 @@ async def update_migration_version(conn, db_name, version):
     )
 
 
+async def delete_dbversion(*, ext_id: str, conn: Optional[Connection] = None) -> None:
+    await (conn or db).execute(
+        """
+        DELETE FROM dbversions WHERE db = ?
+        """,
+        (ext_id,),
+    )
+
+
 # tinyurl
 # -------