Finally I've understood how Gitea templates works

.gitea/template

@@ -1,5 +1,4 @@
-flaskapp/*
+flaskapp/app.py
-static/*
+flaskapp/db.py
-templates/*
+db/schema.sql
-Makefile
+.env
-requirements.txt

flaskapp/admin.py

@@ -30,7 +30,7 @@ class RouteAdmin(routes.Routes):
 
             cur = db.get_cursor()
             cur.execute(
-                'insert into ${REPO_NAME_SNAKE} '
+                f'insert into {db.TABLE} '
                 '(email,name,age) values (%s,%s,%s)',
                 (
                     form.email.data,

flaskapp/db.py

@@ -9,6 +9,7 @@ from pymysql.cursors import Cursor
 
 from . import exts
 
+TABLE = '${REPO_NAME_SNAKE}'
 db_obj: List[Optional[Connection]] = [None]
 
 

flaskapp/pages.py

@@ -19,7 +19,7 @@ class RoutePages(routes.Routes):
         def table():
 
             cur = db.get_cursor()
-            cur.execute('SELECT * FROM ${REPO_NAME_SNAKE}')
+            cur.execute(f'SELECT * FROM {db.TABLE}')
             rows = cur.fetchall()
             cur.close()