.env files, docker-compose, DBConnection class, ManageTable class, methods...

See merge request !2

get_sql method in Field classes, get_sql method in Model class, changes in ManageTable.make_migrations

.env files, docker-compose, DBConnection class, ManageTable class, methods get_fields and save in Model class, method get_params in Field class, tests, configurable name in MetaClass

classes: Field, Fields, Meta, Model and tests

See merge request !1