Added functionality for saving and restoring project files

euclid/database/models/file_snapshot.py

@@ -0,0 +1,15 @@
+from peewee import *
+
+from database.models.components.base_models import BaseModel
+from database.models.development_steps import DevelopmentSteps
+
+class FileSnapshot(BaseModel):
+    development_step = ForeignKeyField(DevelopmentSteps, backref='files')
+    name = CharField()
+    content = TextField()
+
+    class Meta:
+        db_table = 'file_snapshot'
+        indexes = (
+            (('development_step', 'name'), True),
+        )