Add primary key to secondary tables

app/models.py

@@ -82,7 +82,7 @@ class StateRegion(Base):
     __tablename__ = 'state_region'
     state_id = Column(Integer, ForeignKey('state.id'), primary_key=True)
     region_id = Column(Integer, ForeignKey('region.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)
 
 
@@ -137,7 +137,7 @@ class PlayerParty(Base):
     __tablename__ = 'player_party'
     player_id = Column(BigInteger, ForeignKey('player.id'), primary_key=True)
     party_id = Column(Integer, ForeignKey('party.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)
 
 
@@ -146,7 +146,7 @@ class PlayerLocation(Base):
     __tablename__ = 'player_location'
     player_id = Column(BigInteger, ForeignKey('player.id'), primary_key=True)
     region_id = Column(Integer, ForeignKey('region.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)
 
 
@@ -155,7 +155,7 @@ class PlayerResidency(Base):
     __tablename__ = 'player_residency'
     player_id = Column(BigInteger, ForeignKey('player.id'), primary_key=True)
     region_id = Column(Integer, ForeignKey('region.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)
 
 
@@ -164,7 +164,7 @@ class StateWorkPermit(Base):
     __tablename__ = 'state_work_permit'
     state_id = Column(Integer, ForeignKey('state.id'), primary_key=True)
     player_id = Column(BigInteger, ForeignKey('player.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)
 
 
@@ -272,7 +272,7 @@ class FactoryLocation(Base):
     __tablename__ = 'factory_location'
     factory_id = Column(Integer, ForeignKey('factory.id'), primary_key=True)
     region_id = Column(Integer, ForeignKey('region.id'), primary_key=True)
-    from_date_time = Column(DateTime)
+    from_date_time = Column(DateTime, primary_key=True)
     until_date_time = Column(DateTime)