[Update📢] Implement instructions model for recipe

app/models/__init__.py

@@ -3,3 +3,4 @@
 from app.models.recipe import Recipe
 from app.models.comment import Comment
 from app.models.ingredient import Ingredient
+from app.models.instruction import Instruction

app/models/instruction.py

@@ -0,0 +1,19 @@
+from app import db
+from datetime import datetime
+import uuid
+from sqlalchemy.dialects.postgresql import UUID
+
+
+class Instruction(db.Model):
+	id = db.Column(UUID(as_uuid=True), primary_key=True,
+                default=uuid.uuid4)
+	step_number = db.Column(db.Integer, nullable=False)
+	name = db.Column(db.Text, nullable=False)
+	recipe_id = db.Column(UUID(as_uuid=True), db.ForeignKey(
+            'recipe.id'), nullable=False)
+	created_at = db.Column(db.DateTime, default=datetime.utcnow)
+	updated_at = db.Column(
+		db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+	def __repr__(self) -> str:
+		return f'<Instruction {self.step_number}: {self.name[:20]}>'