diff --git a/script/sql/api/1.title.sql b/script/sql/api/1.title.sql
deleted file mode 100644
index 712f9c3..0000000
--- a/script/sql/api/1.title.sql
+++ /dev/null
@@ -1,71 +0,0 @@
-drop function if exists update_title;
-drop function if exists get_title_update_template;
-drop function if exists get_title;
-drop function if exists get_title_schema;
-
-
-create function get_title_schema() returns jsonb as
-$$
-declare
-begin
-    return '{"value": {"opetional": false, "readonly": false}}'::jsonb;
-end;
-$$
-language plpgsql;
-
-
-create function get_title() returns jsonb as
-$$
-declare
-    v_value text;
-begin
-    select value into v_value from title;
-    return format('{"value": "%s"}', v_value)::jsonb;
-end;
-$$
-language plpgsql;
-
-
-create function get_title_update_template() returns jsonb as
-$$
-declare
-begin
-    return '{"operation": "update", "type": "title", "value": ""}'::jsonb;
-end;
-$$
-language plpgsql;
-
-
-create function update_title(new jsonb) returns jsonb as
-$$
-declare
-    old jsonb;
-    redo_sql text;
-    undo_sql text;
-    redo_cs jsonb;
-    undo_cs jsonb;
-
-begin
-    assert new->>'operation' = 'update';
-    assert new->>'type' = 'title';
-    assert new ? 'value';
-
-    old := get_title();
-    if old->>'value' = new->>'value' then
-        return '{}'::jsonb;
-    end if;
-
-    redo_sql := format('update title set value = ''%s''', new->>'value');
-    undo_sql := format('update title set value = ''%s''', old->>'value');
-
-    redo_cs := format('{"operation": "update", "type": "title", "value": "%s" }', new->>'value')::jsonb;
-    undo_cs := format('{"operation": "update", "type": "title", "value": "%s" }', old->>'value')::jsonb;
-
-    execute redo_sql;
-    execute add_operation(redo_sql, undo_sql, redo_cs, undo_cs);
-
-    return redo_cs;
-
-end;
-$$
-language plpgsql;
diff --git a/script/sql/api/api.sql b/script/sql/api/api.sql
deleted file mode 100644
index dfdc2b9..0000000
--- a/script/sql/api/api.sql
+++ /dev/null
@@ -1,37 +0,0 @@
-drop function if exists execute_command;
-drop function if exists execute_update;
-
-create function execute_update(cs jsonb) returns jsonb as
-$$
-declare
-begin
-    assert cs->>'operation' = 'update';
-
-    case cs->>'type'
-        when 'title' then
-            return update_title(cs);
-        else
-            return '{}'::jsonb;
-    end case;
-end;
-$$
-language plpgsql;
-
-
-create function execute_command(cs jsonb) returns jsonb as
-$$
-declare
-begin
-    case cs->>'operation'
-        when 'add' then
-            return '{}'::jsonb;
-        when 'update' then
-            return execute_update(cs);
-        when 'delete' then
-            return '{}'::jsonb;
-        else
-            return '{}'::jsonb;
-    end case;
-end;
-$$
-language plpgsql;
diff --git a/script/sql/api/operation.sql b/script/sql/api/operation.sql
deleted file mode 100644
index 195d458..0000000
--- a/script/sql/api/operation.sql
+++ /dev/null
@@ -1,84 +0,0 @@
-drop function if exists execute_undo;
-drop function if exists add_operation;
-drop function if exists get_current_operation;
-
-
-create function get_current_operation() returns integer as
-$$
-select id from current_operation as result;
-$$
-language sql;
-
-
-create function add_operation(redo_sql text, undo_sql text, redo_cs jsonb, undo_cs jsonb) returns void as
-$$
-declare
-    parent_id integer;
-    op_id integer;
-
-begin
-    parent_id := get_current_operation();
-
-    insert into operation (id, redo, undo, parent, redo_change_set, undo_change_set)
-        values (default, redo_sql, undo_sql, parent_id, redo_cs, undo_cs);
-
-    select max(id) into op_id from operation;
-
-    update current_operation set id = op_id where id = parent_id;
-
-end;
-$$
-language plpgsql;
-
-
-create function execute_undo(discard boolean) returns jsonb as
-$$
-#print_strict_params on
-
-declare
-    op_row operation%ROWTYPE;
-
-begin
-    select * into strict op_row from operation where id = get_current_operation();
-    if op_row.undo = '' then
-        return '{}'::jsonb;
-    end if;
-
-    execute op_row.undo;
-
-    -- update foreign key
-    update current_operation set id = op_row.parent where id = op_row.id;
-
-    if discard then
-        -- update foreign key
-        update operation set redo_child = null where id = op_row.parent;
-        -- on delete cascade => child & snapshot
-        delete from operation where id = op_row.id;
-    else
-        update operation set redo_child = op_row.id where id = op_row.parent;
-    end if;
-
-    return op_row.undo_change_set;
-
-end;
-$$
-language plpgsql;
-
-
--- create function execute_redo() returns jsonb as
--- $$
--- #print_strict_params on
--- 
--- declare
---     op_id integer;
---     redo_c integer;
---     redo_row operation%ROWTYPE;
--- 
--- begin
---     op_id := get_current_operation();
--- 
---     select redo_child into redo_c from operation where id = op_id;
--- 
--- end;
--- $$
--- language plpgsql;
\ No newline at end of file
diff --git a/script/template.py b/script/template.py
index 9270b4a..e6e34a8 100644
--- a/script/template.py
+++ b/script/template.py
@@ -33,12 +33,6 @@ sql_create = [
     "sql/create/operation.sql"
 ]
 
-sql_api = [
-    "sql/api/operation.sql",
-    "sql/api/1.title.sql",
-    "sql/api/api.sql"
-]
-
 sql_drop = [
     "sql/drop/operation.sql",
     "sql/drop/28.end.sql",
@@ -82,10 +76,6 @@ def create_template():
                 with open(sql, "r") as f:
                     cur.execute(f.read())
                 print(f'executed {sql}')
-            for sql in sql_api:
-                with open(sql, "r") as f:
-                    cur.execute(f.read())
-                print(f'executed {sql}')
         conn.commit()
 
 def have_template():