Criação dos models tag e doc_tag

app/models/model-doc_tag.py

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+from sqlalchemy import Column, ForeignKey
+from sqlalchemy.dialects.postgresql import UUID
+import uuid
+
+from .base import Base
+
+class DocTag(Base):
+    __tablename__ = "doc_tag"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    documento_id = Column(UUID(as_uuid=True), ForeignKey("documento.id"), nullable=False)
+    tag_id = Column(UUID(as_uuid=True), ForeignKey("tag.id"), nullable=False)

app/models/model_tag.py

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+from sqlalchemy import Column, String
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.ext.declarative import declarative_base
+import uuid
+
+Base = declarative_base()
+
+class Tag(Base):
+    __tablename__ = "tag"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    nome = Column(String, unique=True, nullable=False)