add experience_links table

apps/backend/app/models/experience_link.py

@@ -0,0 +1,39 @@
+from sqlalchemy import (
+    Column,
+    Integer,
+    String,
+    ForeignKey
+)
+
+from sqlalchemy.orm import relationship
+
+from app.database import Base
+
+
+class ExperienceLink(Base):
+    __tablename__ = "experience_links"
+
+    id = Column(
+        Integer,
+        primary_key=True,
+        index=True
+    )
+
+    link = Column(
+        String(255),
+        nullable=False
+    )
+
+    experience_id = Column(
+        Integer,
+        ForeignKey(
+            "experiences.id",
+            ondelete="CASCADE"
+        ),
+        nullable=False
+    )
+
+    experience = relationship(
+        "Experience",
+        back_populates="links"
+    )