Added relationship between requirements

backend/src/db_models.py

@@ -57,6 +57,7 @@ class User(Base):
         secondary="project_members",
         back_populates="members"
     )
+    created_links: Mapped[List["RequirementLink"]] = relationship("RequirementLink", back_populates="creator")
 
 
 class Tag(Base):
@@ -119,6 +120,7 @@ class Project(Base):
         back_populates="projects"
     )
     requirements: Mapped[List["Requirement"]] = relationship("Requirement", back_populates="project")
+    relationship_types: Mapped[List["RelationshipType"]] = relationship("RelationshipType", back_populates="project")
 
 
 class ProjectMember(Base):
@@ -211,6 +213,16 @@ class Requirement(Base):
         back_populates="requirements"
     )
     validations: Mapped[List["Validation"]] = relationship("Validation", back_populates="requirement")
+    outgoing_links: Mapped[List["RequirementLink"]] = relationship(
+        "RequirementLink",
+        foreign_keys="RequirementLink.source_req_id",
+        back_populates="source_requirement"
+    )
+    incoming_links: Mapped[List["RequirementLink"]] = relationship(
+        "RequirementLink",
+        foreign_keys="RequirementLink.target_req_id",
+        back_populates="target_requirement"
+    )
 
     # Indexes
     __table_args__ = (
@@ -285,3 +297,85 @@ class RequirementHistory(Base):
     valid_from: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
     valid_to: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
     edited_by: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
+
+
+class RelationshipType(Base):
+    """
+    Defines valid relationship types per project.
+    E.g., "Depends On", "Parent", "Conflicts With".
+    """
+    __tablename__ = "relationship_types"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    project_id: Mapped[int] = mapped_column(
+        Integer, 
+        ForeignKey("projects.id", ondelete="CASCADE"), 
+        nullable=False
+    )
+    type_name: Mapped[str] = mapped_column(Text, nullable=False)
+    type_description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    inverse_type_name: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+
+    # Relationships
+    project: Mapped["Project"] = relationship("Project", back_populates="relationship_types")
+    links: Mapped[List["RequirementLink"]] = relationship("RequirementLink", back_populates="relationship_type")
+
+    # Constraints
+    __table_args__ = (
+        UniqueConstraint("project_id", "type_name", name="uq_rel_type_name_project"),
+    )
+
+
+class RequirementLink(Base):
+    """
+    Links between requirements (e.g., dependencies, parent/child, conflicts).
+    """
+    __tablename__ = "requirement_links"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    source_req_id: Mapped[int] = mapped_column(
+        Integer, 
+        ForeignKey("requirements.id", ondelete="CASCADE"), 
+        nullable=False
+    )
+    target_req_id: Mapped[int] = mapped_column(
+        Integer, 
+        ForeignKey("requirements.id", ondelete="CASCADE"), 
+        nullable=False
+    )
+    relationship_type_id: Mapped[int] = mapped_column(
+        Integer, 
+        ForeignKey("relationship_types.id", ondelete="CASCADE"), 
+        nullable=False
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), 
+        default=datetime.utcnow,
+        nullable=True
+    )
+    created_by: Mapped[Optional[int]] = mapped_column(
+        Integer, 
+        ForeignKey("users.id", ondelete="SET NULL"), 
+        nullable=True
+    )
+
+    # Relationships
+    source_requirement: Mapped["Requirement"] = relationship(
+        "Requirement", 
+        foreign_keys=[source_req_id],
+        back_populates="outgoing_links"
+    )
+    target_requirement: Mapped["Requirement"] = relationship(
+        "Requirement", 
+        foreign_keys=[target_req_id],
+        back_populates="incoming_links"
+    )
+    relationship_type: Mapped["RelationshipType"] = relationship("RelationshipType", back_populates="links")
+    creator: Mapped[Optional["User"]] = relationship("User", back_populates="created_links")
+
+    # Indexes and constraints
+    __table_args__ = (
+        Index("idx_link_source", "source_req_id"),
+        Index("idx_link_target", "target_req_id"),
+        UniqueConstraint("source_req_id", "target_req_id", "relationship_type_id", name="uq_req_link_pair"),
+    )

backend/src/main.py

@@ -10,14 +10,17 @@ from src.models import (
     TagResponse, RequirementResponse, PriorityResponse,
     RequirementCreateRequest, RequirementUpdateRequest,
     ProjectResponse, ProjectCreateRequest, ProjectUpdateRequest, ProjectMemberRequest,
-    ValidationStatusResponse, ValidationHistoryResponse, ValidationCreateRequest
+    ValidationStatusResponse, ValidationHistoryResponse, ValidationCreateRequest,
+    RelationshipTypeResponse, RelationshipTypeCreateRequest,
+    RequirementLinkResponse, RequirementLinkCreateRequest, RequirementSearchResult
 )
 from src.controller import AuthController
 from src.config import get_openid, get_settings
 from src.database import init_db, close_db, get_db
 from src.repositories import (
     RoleRepository, GroupRepository, TagRepository, RequirementRepository, 
-    PriorityRepository, ProjectRepository, ValidationStatusRepository, ValidationRepository
+    PriorityRepository, ProjectRepository, ValidationStatusRepository, ValidationRepository,
+    RelationshipTypeRepository, RequirementLinkRepository
 )
 import logging
 
@@ -926,3 +929,297 @@ async def get_validation_history(
         )
         for v in validations
     ]
+
+
+# ===========================================
+# Relationship Types Endpoints
+# ===========================================
+
+@app.get("/api/projects/{project_id}/relationship-types", response_model=List[RelationshipTypeResponse])
+async def get_project_relationship_types(
+    project_id: int,
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Get all relationship types for a project.
+    User must be a member of the project.
+
+    Args:
+        project_id: The project ID
+
+    Returns:
+        List of relationship types for the project.
+    """
+    user = await _get_current_user_db(request, db)
+    await _verify_project_membership(project_id, user.id, db)
+    
+    rel_type_repo = RelationshipTypeRepository(db)
+    rel_types = await rel_type_repo.get_by_project_id(project_id)
+    return [RelationshipTypeResponse.model_validate(rt) for rt in rel_types]
+
+
+@app.post("/api/projects/{project_id}/relationship-types", response_model=RelationshipTypeResponse, status_code=status.HTTP_201_CREATED)
+async def create_relationship_type(
+    project_id: int,
+    request: Request,
+    type_data: RelationshipTypeCreateRequest,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Create a new relationship type for a project.
+    Only admins (role_id=1) can create relationship types.
+
+    Args:
+        project_id: The project ID
+        type_data: The relationship type data
+
+    Returns:
+        The created relationship type.
+    """
+    user = await _get_current_user_db(request, db)
+    
+    # Only admins can create relationship types
+    _require_role(user, [1], "create relationship types")
+    
+    await _verify_project_membership(project_id, user.id, db)
+    
+    rel_type_repo = RelationshipTypeRepository(db)
+    rel_type = await rel_type_repo.create(
+        project_id=project_id,
+        type_name=type_data.type_name,
+        type_description=type_data.type_description,
+        inverse_type_name=type_data.inverse_type_name
+    )
+    
+    await db.commit()
+    return RelationshipTypeResponse.model_validate(rel_type)
+
+
+# ===========================================
+# Requirement Search Endpoint (for autocomplete)
+# ===========================================
+
+@app.get("/api/projects/{project_id}/requirements/search", response_model=List[RequirementSearchResult])
+async def search_requirements(
+    project_id: int,
+    request: Request,
+    q: str = "",
+    exclude_id: Optional[int] = None,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Search requirements by name or tag code for autocomplete.
+    User must be a member of the project.
+
+    Args:
+        project_id: The project ID
+        q: Search query (searches tag_code and req_name)
+        exclude_id: Optional requirement ID to exclude from results (to prevent self-linking)
+
+    Returns:
+        List of matching requirements (limited to 20).
+    """
+    user = await _get_current_user_db(request, db)
+    await _verify_project_membership(project_id, user.id, db)
+    
+    req_repo = RequirementRepository(db)
+    requirements = await req_repo.search_by_name_or_tag(
+        project_id=project_id,
+        query=q,
+        exclude_id=exclude_id,
+        limit=20
+    )
+    
+    return [
+        RequirementSearchResult(
+            id=req.id,
+            req_name=req.req_name,
+            tag_code=req.tag.tag_code
+        )
+        for req in requirements
+    ]
+
+
+# ===========================================
+# Requirement Links Endpoints
+# ===========================================
+
+@app.get("/api/requirements/{requirement_id}/links", response_model=List[RequirementLinkResponse])
+async def get_requirement_links(
+    requirement_id: int,
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Get all links for a requirement (both outgoing and incoming).
+    User must be a member of the requirement's project.
+
+    Args:
+        requirement_id: The requirement ID
+
+    Returns:
+        List of links with direction info.
+    """
+    user = await _get_current_user_db(request, db)
+    
+    # Check if requirement exists
+    req_repo = RequirementRepository(db)
+    requirement = await req_repo.get_by_id(requirement_id)
+    if not requirement:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Requirement with id {requirement_id} not found"
+        )
+    
+    await _verify_project_membership(requirement.project_id, user.id, db)
+    
+    link_repo = RequirementLinkRepository(db)
+    links = await link_repo.get_by_requirement_id(requirement_id)
+    
+    return [RequirementLinkResponse(**link) for link in links]
+
+
+@app.post("/api/requirements/{requirement_id}/links", response_model=RequirementLinkResponse, status_code=status.HTTP_201_CREATED)
+async def create_requirement_link(
+    requirement_id: int,
+    request: Request,
+    link_data: RequirementLinkCreateRequest,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Create a new link from this requirement to another.
+    User must be a member of the project.
+    Auditors (role_id=2) cannot create links.
+
+    Args:
+        requirement_id: The source requirement ID
+        link_data: The target requirement and relationship type
+
+    Returns:
+        The created link.
+    """
+    user = await _get_current_user_db(request, db)
+    
+    # Auditors cannot create links
+    _require_role(user, [1, 3], "create requirement links")
+    
+    req_repo = RequirementRepository(db)
+    
+    # Check if source requirement exists
+    source_req = await req_repo.get_by_id(requirement_id)
+    if not source_req:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Requirement with id {requirement_id} not found"
+        )
+    
+    await _verify_project_membership(source_req.project_id, user.id, db)
+    
+    # Check if target requirement exists
+    target_req = await req_repo.get_by_id(link_data.target_requirement_id)
+    if not target_req:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Target requirement with id {link_data.target_requirement_id} not found"
+        )
+    
+    # Prevent self-linking
+    if requirement_id == link_data.target_requirement_id:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot link a requirement to itself"
+        )
+    
+    # Verify both requirements are in the same project
+    if source_req.project_id != target_req.project_id:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot link requirements from different projects"
+        )
+    
+    # Verify relationship type exists and belongs to the project
+    rel_type_repo = RelationshipTypeRepository(db)
+    rel_type = await rel_type_repo.get_by_id(link_data.relationship_type_id)
+    if not rel_type:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Relationship type with id {link_data.relationship_type_id} not found"
+        )
+    if rel_type.project_id != source_req.project_id:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Relationship type does not belong to this project"
+        )
+    
+    # Check if link already exists
+    link_repo = RequirementLinkRepository(db)
+    if await link_repo.link_exists(requirement_id, link_data.target_requirement_id, link_data.relationship_type_id):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="This link already exists"
+        )
+    
+    # Create the link
+    link = await link_repo.create(
+        source_req_id=requirement_id,
+        target_req_id=link_data.target_requirement_id,
+        relationship_type_id=link_data.relationship_type_id,
+        created_by=user.id
+    )
+    
+    await db.commit()
+    
+    return RequirementLinkResponse(
+        id=link.id,
+        direction="outgoing",
+        type_name=rel_type.type_name,
+        type_id=link.relationship_type_id,
+        inverse_type_name=rel_type.inverse_type_name,
+        linked_requirement={
+            "id": target_req.id,
+            "req_name": target_req.req_name,
+            "tag_code": target_req.tag.tag_code
+        },
+        created_by_username=user.sub,
+        created_by_id=user.id,
+        created_at=link.created_at
+    )
+
+
+@app.delete("/api/requirement-links/{link_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_requirement_link(
+    link_id: int,
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Delete a requirement link.
+    Only the creator or an admin can delete a link.
+
+    Args:
+        link_id: The link ID to delete
+    """
+    user = await _get_current_user_db(request, db)
+    
+    link_repo = RequirementLinkRepository(db)
+    link = await link_repo.get_by_id(link_id)
+    
+    if not link:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Link with id {link_id} not found"
+        )
+    
+    # Verify user is a member of the project
+    await _verify_project_membership(link.source_requirement.project_id, user.id, db)
+    
+    # Only creator or admin can delete
+    if link.created_by != user.id and user.role_id != 1:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Only the link creator or an admin can delete this link"
+        )
+    
+    await link_repo.delete(link_id)
+    await db.commit()

backend/src/models.py

@@ -193,3 +193,67 @@ class RequirementUpdateRequest(BaseModel):
     tag_id: Optional[int] = None
     priority_id: Optional[int] = None
     group_ids: Optional[List[int]] = None
+
+
+# Relationship Type schemas
+class RelationshipTypeResponse(BaseModel):
+    """Response schema for a relationship type."""
+    id: int
+    project_id: int
+    type_name: str
+    type_description: Optional[str] = None
+    inverse_type_name: Optional[str] = None
+
+    class Config:
+        from_attributes = True
+
+
+class RelationshipTypeCreateRequest(BaseModel):
+    """Request schema for creating a relationship type."""
+    type_name: str
+    type_description: Optional[str] = None
+    inverse_type_name: Optional[str] = None
+
+
+# Requirement Link schemas
+class LinkedRequirementInfo(BaseModel):
+    """Brief info about a linked requirement."""
+    id: int
+    req_name: str
+    tag_code: str
+
+    class Config:
+        from_attributes = True
+
+
+class RequirementLinkResponse(BaseModel):
+    """Response schema for a requirement link with direction."""
+    id: int
+    direction: str  # 'outgoing' or 'incoming'
+    type_name: str
+    type_id: int
+    inverse_type_name: Optional[str] = None
+    linked_requirement: LinkedRequirementInfo
+    created_by_username: Optional[str] = None
+    created_by_id: Optional[int] = None
+    created_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+class RequirementLinkCreateRequest(BaseModel):
+    """Request schema for creating a requirement link."""
+    relationship_type_id: int
+    target_requirement_id: int
+
+
+# Requirement Search schemas
+class RequirementSearchResult(BaseModel):
+    """Response schema for requirement search results (for autocomplete)."""
+    id: int
+    req_name: str
+    tag_code: str
+
+    class Config:
+        from_attributes = True

backend/src/repositories/__init__.py

@@ -9,6 +9,8 @@ from src.repositories.priority_repository import PriorityRepository
 from src.repositories.project_repository import ProjectRepository
 from src.repositories.validation_status_repository import ValidationStatusRepository
 from src.repositories.validation_repository import ValidationRepository
+from src.repositories.relationship_type_repository import RelationshipTypeRepository
+from src.repositories.requirement_link_repository import RequirementLinkRepository
 
 __all__ = [
     "UserRepository",
@@ -20,4 +22,6 @@ __all__ = [
     "ProjectRepository",
     "ValidationStatusRepository",
     "ValidationRepository",
+    "RelationshipTypeRepository",
+    "RequirementLinkRepository",
 ]

backend/src/repositories/relationship_type_repository.py

@@ -0,0 +1,97 @@
+"""
+Repository for RelationshipType database operations.
+"""
+from typing import List, Optional
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from src.db_models import RelationshipType
+
+
+class RelationshipTypeRepository:
+    """Repository for relationship type CRUD operations."""
+
+    def __init__(self, db: AsyncSession):
+        self.db = db
+
+    async def get_by_project_id(self, project_id: int) -> List[RelationshipType]:
+        """
+        Get all relationship types for a project.
+        
+        Args:
+            project_id: The project ID
+            
+        Returns:
+            List of relationship types for the project.
+        """
+        result = await self.db.execute(
+            select(RelationshipType)
+            .where(RelationshipType.project_id == project_id)
+            .order_by(RelationshipType.type_name)
+        )
+        return list(result.scalars().all())
+
+    async def get_by_id(self, relationship_type_id: int) -> Optional[RelationshipType]:
+        """
+        Get a relationship type by ID.
+        
+        Args:
+            relationship_type_id: The relationship type ID
+            
+        Returns:
+            The relationship type or None if not found.
+        """
+        result = await self.db.execute(
+            select(RelationshipType)
+            .where(RelationshipType.id == relationship_type_id)
+        )
+        return result.scalar_one_or_none()
+
+    async def create(
+        self,
+        project_id: int,
+        type_name: str,
+        type_description: Optional[str] = None,
+        inverse_type_name: Optional[str] = None
+    ) -> RelationshipType:
+        """
+        Create a new relationship type.
+        
+        Args:
+            project_id: The project this type belongs to
+            type_name: Name of the relationship (e.g., "Depends On")
+            type_description: Optional description
+            inverse_type_name: Optional inverse name (e.g., "Depended By")
+            
+        Returns:
+            The created relationship type.
+        """
+        relationship_type = RelationshipType(
+            project_id=project_id,
+            type_name=type_name,
+            type_description=type_description,
+            inverse_type_name=inverse_type_name
+        )
+        self.db.add(relationship_type)
+        await self.db.flush()
+        await self.db.refresh(relationship_type)
+        return relationship_type
+
+    async def delete(self, relationship_type_id: int) -> bool:
+        """
+        Delete a relationship type by ID.
+        
+        Args:
+            relationship_type_id: The ID of the relationship type to delete
+            
+        Returns:
+            True if deleted, False if not found.
+        """
+        result = await self.db.execute(
+            select(RelationshipType).where(RelationshipType.id == relationship_type_id)
+        )
+        relationship_type = result.scalar_one_or_none()
+        if relationship_type:
+            await self.db.delete(relationship_type)
+            await self.db.flush()
+            return True
+        return False

backend/src/repositories/requirement_link_repository.py

@@ -0,0 +1,192 @@
+"""
+Repository for RequirementLink database operations.
+"""
+from typing import List, Optional, Dict, Any
+from sqlalchemy import select, or_
+from sqlalchemy.orm import selectinload
+from sqlalchemy.ext.asyncio import AsyncSession
+from src.db_models import RequirementLink, Requirement, RelationshipType, User
+
+
+class RequirementLinkRepository:
+    """Repository for requirement link CRUD operations."""
+
+    def __init__(self, db: AsyncSession):
+        self.db = db
+
+    async def get_by_requirement_id(self, requirement_id: int) -> List[Dict[str, Any]]:
+        """
+        Get all links for a requirement (both outgoing and incoming).
+        Returns a list of dicts with direction info.
+        
+        Args:
+            requirement_id: The requirement ID
+            
+        Returns:
+            List of link data with direction ('outgoing' or 'incoming').
+        """
+        # Get outgoing links (this requirement is the source)
+        outgoing_result = await self.db.execute(
+            select(RequirementLink)
+            .options(
+                selectinload(RequirementLink.target_requirement).selectinload(Requirement.tag),
+                selectinload(RequirementLink.relationship_type),
+                selectinload(RequirementLink.creator)
+            )
+            .where(RequirementLink.source_req_id == requirement_id)
+            .order_by(RequirementLink.created_at.desc())
+        )
+        outgoing_links = outgoing_result.scalars().all()
+
+        # Get incoming links (this requirement is the target)
+        incoming_result = await self.db.execute(
+            select(RequirementLink)
+            .options(
+                selectinload(RequirementLink.source_requirement).selectinload(Requirement.tag),
+                selectinload(RequirementLink.relationship_type),
+                selectinload(RequirementLink.creator)
+            )
+            .where(RequirementLink.target_req_id == requirement_id)
+            .order_by(RequirementLink.created_at.desc())
+        )
+        incoming_links = incoming_result.scalars().all()
+
+        # Build result list with direction info
+        result = []
+        
+        for link in outgoing_links:
+            result.append({
+                "id": link.id,
+                "direction": "outgoing",
+                "type_name": link.relationship_type.type_name,
+                "type_id": link.relationship_type_id,
+                "inverse_type_name": link.relationship_type.inverse_type_name,
+                "linked_requirement": {
+                    "id": link.target_requirement.id,
+                    "req_name": link.target_requirement.req_name,
+                    "tag_code": link.target_requirement.tag.tag_code
+                },
+                "created_by_username": link.creator.sub if link.creator else None,
+                "created_by_id": link.created_by,
+                "created_at": link.created_at
+            })
+
+        for link in incoming_links:
+            result.append({
+                "id": link.id,
+                "direction": "incoming",
+                "type_name": link.relationship_type.inverse_type_name or link.relationship_type.type_name,
+                "type_id": link.relationship_type_id,
+                "inverse_type_name": link.relationship_type.type_name,
+                "linked_requirement": {
+                    "id": link.source_requirement.id,
+                    "req_name": link.source_requirement.req_name,
+                    "tag_code": link.source_requirement.tag.tag_code
+                },
+                "created_by_username": link.creator.sub if link.creator else None,
+                "created_by_id": link.created_by,
+                "created_at": link.created_at
+            })
+
+        # Sort by created_at descending
+        result.sort(key=lambda x: x["created_at"] or "", reverse=True)
+        return result
+
+    async def get_by_id(self, link_id: int) -> Optional[RequirementLink]:
+        """
+        Get a link by ID with related data.
+        
+        Args:
+            link_id: The link ID
+            
+        Returns:
+            The link or None if not found.
+        """
+        result = await self.db.execute(
+            select(RequirementLink)
+            .options(
+                selectinload(RequirementLink.source_requirement),
+                selectinload(RequirementLink.target_requirement),
+                selectinload(RequirementLink.relationship_type),
+                selectinload(RequirementLink.creator)
+            )
+            .where(RequirementLink.id == link_id)
+        )
+        return result.scalar_one_or_none()
+
+    async def create(
+        self,
+        source_req_id: int,
+        target_req_id: int,
+        relationship_type_id: int,
+        created_by: Optional[int] = None
+    ) -> RequirementLink:
+        """
+        Create a new requirement link.
+        
+        Args:
+            source_req_id: The source requirement ID
+            target_req_id: The target requirement ID
+            relationship_type_id: The type of relationship
+            created_by: The user creating the link
+            
+        Returns:
+            The created link.
+        """
+        link = RequirementLink(
+            source_req_id=source_req_id,
+            target_req_id=target_req_id,
+            relationship_type_id=relationship_type_id,
+            created_by=created_by
+        )
+        self.db.add(link)
+        await self.db.flush()
+        await self.db.refresh(link)
+        return link
+
+    async def delete(self, link_id: int) -> bool:
+        """
+        Delete a link by ID.
+        
+        Args:
+            link_id: The ID of the link to delete
+            
+        Returns:
+            True if deleted, False if not found.
+        """
+        result = await self.db.execute(
+            select(RequirementLink).where(RequirementLink.id == link_id)
+        )
+        link = result.scalar_one_or_none()
+        if link:
+            await self.db.delete(link)
+            await self.db.flush()
+            return True
+        return False
+
+    async def link_exists(
+        self,
+        source_req_id: int,
+        target_req_id: int,
+        relationship_type_id: int
+    ) -> bool:
+        """
+        Check if a link already exists between two requirements with the same type.
+        
+        Args:
+            source_req_id: The source requirement ID
+            target_req_id: The target requirement ID
+            relationship_type_id: The relationship type ID
+            
+        Returns:
+            True if link exists, False otherwise.
+        """
+        result = await self.db.execute(
+            select(RequirementLink)
+            .where(
+                RequirementLink.source_req_id == source_req_id,
+                RequirementLink.target_req_id == target_req_id,
+                RequirementLink.relationship_type_id == relationship_type_id
+            )
+        )
+        return result.scalar_one_or_none() is not None

backend/src/repositories/requirement_repository.py

@@ -300,3 +300,52 @@ class RequirementRepository:
         await self.session.delete(requirement)
         await self.session.flush()
         return True
+
+    async def search_by_name_or_tag(
+        self,
+        project_id: int,
+        query: str,
+        exclude_id: Optional[int] = None,
+        limit: int = 20
+    ) -> List[Requirement]:
+        """
+        Search requirements by name or tag code within a project.
+        Used for autocomplete in the add relationship modal.
+        
+        Args:
+            project_id: The project ID to search within
+            query: The search query (searches req_name and tag_code)
+            exclude_id: Optional requirement ID to exclude from results
+            limit: Maximum number of results to return
+            
+        Returns:
+            List of matching requirements
+        """
+        from sqlalchemy import or_, func
+        
+        stmt = (
+            select(Requirement)
+            .options(selectinload(Requirement.tag))
+            .join(Requirement.tag)
+            .where(Requirement.project_id == project_id)
+        )
+        
+        # Add search filter if query is provided
+        if query:
+            # Trim whitespace and search
+            search_term = f"%{query.strip().lower()}%"
+            stmt = stmt.where(
+                or_(
+                    func.lower(Requirement.req_name).like(search_term),
+                    func.lower(Tag.tag_code).like(search_term)
+                )
+            )
+        
+        # Exclude specific requirement (to prevent self-linking)
+        if exclude_id is not None:
+            stmt = stmt.where(Requirement.id != exclude_id)
+        
+        stmt = stmt.order_by(Tag.tag_code, Requirement.req_name).limit(limit)
+        
+        result = await self.session.execute(stmt)
+        return list(result.scalars().all())

frontend/src/pages/RequirementDetailPage.tsx

@@ -1,12 +1,13 @@
 import { useState, useEffect } from 'react'
 import { useAuth, useProject } from '@/hooks'
 import { useParams, Link } from 'react-router-dom'
-import { requirementService, validationService } from '@/services'
+import { requirementService, validationService, relationshipService } from '@/services'
 import type { Requirement } from '@/services/requirementService'
+import type { RelationshipType, RequirementLink, RequirementSearchResult } from '@/services/relationshipService'
 import type { ValidationStatus, ValidationHistory } from '@/types'
 
 // Tab types
-type TabType = 'description' | 'sub-requirements' | 'co-requirements' | 'acceptance-criteria' | 'shared-comments' | 'validate'
+type TabType = 'description' | 'relationships' | 'acceptance-criteria' | 'shared-comments' | 'validate'
 
 export default function RequirementDetailPage() {
   const { user, logout, isAuditor } = useAuth()
@@ -26,6 +27,20 @@ export default function RequirementDetailPage() {
   const [validationError, setValidationError] = useState<string | null>(null)
   const [historyLoading, setHistoryLoading] = useState(false)
 
+  // Relationships state
+  const [relationshipLinks, setRelationshipLinks] = useState<RequirementLink[]>([])
+  const [relationshipTypes, setRelationshipTypes] = useState<RelationshipType[]>([])
+  const [relationshipsLoading, setRelationshipsLoading] = useState(false)
+  const [showAddRelationshipModal, setShowAddRelationshipModal] = useState(false)
+  const [selectedRelationshipType, setSelectedRelationshipType] = useState<number | ''>('')
+  const [targetSearchQuery, setTargetSearchQuery] = useState('')
+  const [searchResults, setSearchResults] = useState<RequirementSearchResult[]>([])
+  const [selectedTarget, setSelectedTarget] = useState<RequirementSearchResult | null>(null)
+  const [searchLoading, setSearchLoading] = useState(false)
+  const [addLinkLoading, setAddLinkLoading] = useState(false)
+  const [addLinkError, setAddLinkError] = useState<string | null>(null)
+  const [deletingLinkId, setDeletingLinkId] = useState<number | null>(null)
+
   // Fetch requirement data on mount
   useEffect(() => {
     const fetchRequirement = async () => {
@@ -74,6 +89,56 @@ export default function RequirementDetailPage() {
     fetchValidationData()
   }, [activeTab, id])
 
+  // Fetch relationships data when relationships tab is active
+  useEffect(() => {
+    const fetchRelationshipsData = async () => {
+      if (activeTab !== 'relationships' || !id || !currentProject) return
+
+      try {
+        setRelationshipsLoading(true)
+        const [links, types] = await Promise.all([
+          relationshipService.getRequirementLinks(parseInt(id, 10)),
+          relationshipService.getRelationshipTypes(currentProject.id)
+        ])
+        setRelationshipLinks(links)
+        setRelationshipTypes(types)
+      } catch (err) {
+        console.error('Failed to fetch relationships data:', err)
+      } finally {
+        setRelationshipsLoading(false)
+      }
+    }
+
+    fetchRelationshipsData()
+  }, [activeTab, id, currentProject])
+
+  // Debounced search for target requirements
+  useEffect(() => {
+    if (!showAddRelationshipModal || !currentProject || !id) return
+    if (targetSearchQuery.length < 1) {
+      setSearchResults([])
+      return
+    }
+
+    const timeoutId = setTimeout(async () => {
+      try {
+        setSearchLoading(true)
+        const results = await relationshipService.searchRequirements(
+          currentProject.id,
+          targetSearchQuery,
+          parseInt(id, 10) // Exclude current requirement
+        )
+        setSearchResults(results)
+      } catch (err) {
+        console.error('Failed to search requirements:', err)
+      } finally {
+        setSearchLoading(false)
+      }
+    }, 300)
+
+    return () => clearTimeout(timeoutId)
+  }, [targetSearchQuery, showAddRelationshipModal, currentProject, id])
+
   // Handle validation submission
   const handleSubmitValidation = async () => {
     if (!selectedStatusId || !id) {
@@ -108,6 +173,80 @@ export default function RequirementDetailPage() {
     }
   }
 
+  // Handle opening add relationship modal
+  const openAddRelationshipModal = () => {
+    setShowAddRelationshipModal(true)
+    setSelectedRelationshipType('')
+    setTargetSearchQuery('')
+    setSearchResults([])
+    setSelectedTarget(null)
+    setAddLinkError(null)
+  }
+
+  // Handle closing add relationship modal
+  const closeAddRelationshipModal = () => {
+    setShowAddRelationshipModal(false)
+    setAddLinkError(null)
+  }
+
+  // Handle selecting a target requirement from search
+  const handleSelectTarget = (result: RequirementSearchResult) => {
+    setSelectedTarget(result)
+    setTargetSearchQuery(`${result.tag_code} - ${result.req_name}`)
+    setSearchResults([])
+  }
+
+  // Handle creating a new relationship link
+  const handleCreateLink = async () => {
+    if (!selectedRelationshipType || !selectedTarget || !id) {
+      setAddLinkError('Please select a relationship type and target requirement')
+      return
+    }
+
+    try {
+      setAddLinkLoading(true)
+      setAddLinkError(null)
+
+      const newLink = await relationshipService.createLink(parseInt(id, 10), {
+        relationship_type_id: selectedRelationshipType as number,
+        target_requirement_id: selectedTarget.id
+      })
+
+      // Add to links list
+      setRelationshipLinks(prev => [newLink, ...prev])
+      
+      // Close modal
+      closeAddRelationshipModal()
+    } catch (err) {
+      console.error('Failed to create link:', err)
+      setAddLinkError(err instanceof Error ? err.message : 'Failed to create link. Please try again.')
+    } finally {
+      setAddLinkLoading(false)
+    }
+  }
+
+  // Handle deleting a relationship link
+  const handleDeleteLink = async (linkId: number) => {
+    if (!confirm('Are you sure you want to delete this relationship?')) return
+
+    try {
+      setDeletingLinkId(linkId)
+      await relationshipService.deleteLink(linkId)
+      setRelationshipLinks(prev => prev.filter(link => link.id !== linkId))
+    } catch (err) {
+      console.error('Failed to delete link:', err)
+      alert(err instanceof Error ? err.message : 'Failed to delete link')
+    } finally {
+      setDeletingLinkId(null)
+    }
+  }
+
+  // Check if user can delete a link (creator or admin)
+  const canDeleteLink = (link: RequirementLink): boolean => {
+    if (!user) return false
+    return user.role_id === 1 || link.created_by_id === user.db_user_id
+  }
+
   // Get validation status style
   const getValidationStatusStyle = (status: string): string => {
     switch (status) {
@@ -151,8 +290,7 @@ export default function RequirementDetailPage() {
 
   const tabs: { id: TabType; label: string }[] = [
     { id: 'description', label: 'Description' },
-    { id: 'sub-requirements', label: 'Sub-Requirements' },
+    { id: 'relationships', label: 'Relationships' },
-    { id: 'co-requirements', label: 'Co-Requirements' },
     { id: 'acceptance-criteria', label: 'Acceptance Criteria' },
     { id: 'shared-comments', label: 'Shared Comments' },
     { id: 'validate', label: 'Validate' },
@@ -205,31 +343,100 @@ export default function RequirementDetailPage() {
           </div>
         )
 
-      case 'sub-requirements':
+      case 'relationships':
         return (
           <div>
-            <h3 className="text-xl font-bold text-gray-800 mb-4">Sub-Requirements</h3>
+            <div className="flex items-center justify-between mb-4">
-            <p className="text-gray-500">No sub-requirements defined yet.</p>
+              <h3 className="text-xl font-bold text-gray-800">Relationships</h3>
               {!isAuditor && (
-              <div className="mt-4">
+                <button
-                <button className="px-4 py-1.5 border border-gray-400 rounded text-sm text-gray-700 hover:bg-gray-50">
+                  onClick={openAddRelationshipModal}
-                  Add Sub-Requirement
+                  disabled={relationshipTypes.length === 0}
+                  className="px-4 py-1.5 bg-teal-600 text-white rounded text-sm font-medium hover:bg-teal-700 disabled:opacity-50 disabled:cursor-not-allowed"
+                  title={relationshipTypes.length === 0 ? 'No relationship types defined for this project. Contact an admin to set them up.' : ''}
+                >
+                  Add Relationship
                 </button>
-              </div>
               )}
             </div>
-        )
 
-      case 'co-requirements':
+            {relationshipTypes.length === 0 && !relationshipsLoading && (
-        return (
+              <div className="mb-4 p-3 bg-yellow-50 border border-yellow-200 rounded text-sm text-yellow-800">
-          <div>
+                No relationship types have been defined for this project. Contact an administrator to set up relationship types.
-            <h3 className="text-xl font-bold text-gray-800 mb-4">Co-Requirements</h3>
+              </div>
-            <p className="text-gray-500">No co-requirements defined yet.</p>
+            )}
-            {!isAuditor && (
+
-              <div className="mt-4">
+            {relationshipsLoading ? (
-                <button className="px-4 py-1.5 border border-gray-400 rounded text-sm text-gray-700 hover:bg-gray-50">
+              <div className="text-center py-8">
-                  Add Co-Requirement
+                <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-teal-600 mx-auto"></div>
+                <p className="mt-2 text-gray-500 text-sm">Loading relationships...</p>
+              </div>
+            ) : relationshipLinks.length === 0 ? (
+              <p className="text-gray-500 text-center py-8">No relationships defined yet.</p>
+            ) : (
+              <div className="overflow-x-auto">
+                <table className="w-full border border-gray-200 rounded">
+                  <thead className="bg-gray-50">
+                    <tr>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Direction</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Type</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Linked Requirement</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Created By</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Date</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Actions</th>
+                    </tr>
+                  </thead>
+                  <tbody className="bg-white divide-y divide-gray-200">
+                    {relationshipLinks.map((link) => (
+                      <tr key={link.id}>
+                        <td className="px-4 py-3 text-sm text-gray-700">
+                          <span className={`inline-flex items-center px-2 py-0.5 rounded text-xs font-medium ${
+                            link.direction === 'outgoing' 
+                              ? 'bg-blue-100 text-blue-800' 
+                              : 'bg-purple-100 text-purple-800'
+                          }`}>
+                            {link.direction === 'outgoing' ? '→ Outgoing' : '← Incoming'}
+                          </span>
+                        </td>
+                        <td className="px-4 py-3 text-sm text-gray-700">
+                          {link.type_name}
+                        </td>
+                        <td className="px-4 py-3 text-sm">
+                          <Link 
+                            to={`/requirements/${link.linked_requirement.id}`}
+                            className="text-teal-600 hover:underline"
+                          >
+                            {link.linked_requirement.tag_code} - {link.linked_requirement.req_name}
+                          </Link>
+                        </td>
+                        <td className="px-4 py-3 text-sm text-gray-700">
+                          {link.created_by_username ? `@${link.created_by_username}` : <span className="text-gray-400 italic">Unknown</span>}
+                        </td>
+                        <td className="px-4 py-3 text-sm text-gray-700">
+                          {link.created_at 
+                            ? new Date(link.created_at).toLocaleDateString() 
+                            : 'N/A'}
+                        </td>
+                        <td className="px-4 py-3 text-sm">
+                          {canDeleteLink(link) && (
+                            <button
+                              onClick={() => handleDeleteLink(link.id)}
+                              disabled={deletingLinkId === link.id}
+                              className="text-red-600 hover:text-red-800 disabled:opacity-50"
+                              title="Delete relationship"
+                            >
+                              {deletingLinkId === link.id ? (
+                                <span className="animate-spin inline-block">⏳</span>
+                              ) : (
+                                '🗑️'
+                              )}
                             </button>
+                          )}
+                        </td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
               </div>
             )}
           </div>
@@ -552,6 +759,121 @@ export default function RequirementDetailPage() {
           </div>
         </div>
       </div>
+
+      {/* Add Relationship Modal */}
+      {showAddRelationshipModal && (
+        <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
+          <div className="bg-white rounded-lg shadow-xl w-full max-w-lg mx-4">
+            {/* Modal Header */}
+            <div className="flex items-center justify-between px-6 py-4 border-b border-gray-200">
+              <h2 className="text-xl font-semibold text-gray-800">Add Relationship</h2>
+              <button
+                onClick={closeAddRelationshipModal}
+                className="text-gray-400 hover:text-gray-600"
+              >
+                ✕
+              </button>
+            </div>
+
+            {/* Modal Body */}
+            <div className="px-6 py-4 space-y-4">
+              {addLinkError && (
+                <div className="p-3 bg-red-100 border border-red-400 text-red-700 rounded text-sm">
+                  {addLinkError}
+                </div>
+              )}
+
+              {/* Relationship Type Selection */}
+              <div>
+                <label className="block text-sm font-medium text-gray-700 mb-1">
+                  Relationship Type <span className="text-red-500">*</span>
+                </label>
+                <select
+                  value={selectedRelationshipType}
+                  onChange={(e) => setSelectedRelationshipType(e.target.value ? Number(e.target.value) : '')}
+                  className="w-full px-3 py-2 border border-gray-300 rounded text-sm focus:outline-none focus:ring-2 focus:ring-teal-500 focus:border-transparent"
+                  disabled={addLinkLoading}
+                >
+                  <option value="">Select a relationship type...</option>
+                  {relationshipTypes.map((type) => (
+                    <option key={type.id} value={type.id}>
+                      {type.type_name}
+                      {type.inverse_type_name && ` (inverse: ${type.inverse_type_name})`}
+                    </option>
+                  ))}
+                </select>
+              </div>
+
+              {/* Target Requirement Search */}
+              <div>
+                <label className="block text-sm font-medium text-gray-700 mb-1">
+                  Target Requirement <span className="text-red-500">*</span>
+                </label>
+                <div className="relative">
+                  <input
+                    type="text"
+                    value={targetSearchQuery}
+                    onChange={(e) => {
+                      setTargetSearchQuery(e.target.value)
+                      setSelectedTarget(null)
+                    }}
+                    placeholder="Search by tag code or name..."
+                    className="w-full px-3 py-2 border border-gray-300 rounded text-sm focus:outline-none focus:ring-2 focus:ring-teal-500 focus:border-transparent"
+                    disabled={addLinkLoading}
+                  />
+                  {searchLoading && (
+                    <div className="absolute right-3 top-1/2 transform -translate-y-1/2">
+                      <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-teal-600"></div>
+                    </div>
+                  )}
+                  
+                  {/* Search Results Dropdown */}
+                  {searchResults.length > 0 && !selectedTarget && (
+                    <div className="absolute z-10 w-full mt-1 bg-white border border-gray-300 rounded shadow-lg max-h-48 overflow-y-auto">
+                      {searchResults.map((result) => (
+                        <button
+                          key={result.id}
+                          type="button"
+                          onClick={() => handleSelectTarget(result)}
+                          className="w-full px-3 py-2 text-left text-sm hover:bg-gray-100 focus:bg-gray-100 focus:outline-none"
+                        >
+                          <span className="font-medium text-teal-600">{result.tag_code}</span>
+                          <span className="text-gray-600"> - {result.req_name}</span>
+                        </button>
+                      ))}
+                    </div>
+                  )}
+                </div>
+                {selectedTarget && (
+                  <p className="mt-1 text-sm text-green-600">
+                    ✓ Selected: {selectedTarget.tag_code} - {selectedTarget.req_name}
+                  </p>
+                )}
+              </div>
+            </div>
+
+            {/* Modal Footer */}
+            <div className="flex justify-end gap-3 px-6 py-4 border-t border-gray-200 bg-gray-50 rounded-b-lg">
+              <button
+                type="button"
+                onClick={closeAddRelationshipModal}
+                className="px-4 py-2 border border-gray-300 rounded text-sm text-gray-700 hover:bg-gray-100"
+                disabled={addLinkLoading}
+              >
+                Cancel
+              </button>
+              <button
+                type="button"
+                onClick={handleCreateLink}
+                disabled={addLinkLoading || !selectedRelationshipType || !selectedTarget}
+                className="px-4 py-2 bg-teal-600 text-white rounded text-sm font-medium hover:bg-teal-700 disabled:opacity-50 disabled:cursor-not-allowed"
+              >
+                {addLinkLoading ? 'Creating...' : 'Create Relationship'}
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }

frontend/src/services/index.ts

@@ -10,3 +10,10 @@ export type { Requirement, RequirementCreateRequest, RequirementUpdateRequest }
 export { projectService } from './projectService'
 export type { Project, ProjectCreateRequest, ProjectUpdateRequest } from './projectService'
 export { validationService } from './validationService'
+export { relationshipService } from './relationshipService'
+export type { 
+  RelationshipType, 
+  RequirementLink, 
+  RequirementSearchResult,
+  RequirementLinkCreateRequest 
+} from './relationshipService'

frontend/src/services/relationshipService.ts

@@ -0,0 +1,154 @@
+const API_BASE_URL = '/api'
+
+// Types
+export interface RelationshipType {
+  id: number
+  project_id: number
+  type_name: string
+  type_description: string | null
+  inverse_type_name: string | null
+}
+
+export interface LinkedRequirementInfo {
+  id: number
+  req_name: string
+  tag_code: string
+}
+
+export interface RequirementLink {
+  id: number
+  direction: 'outgoing' | 'incoming'
+  type_name: string
+  type_id: number
+  inverse_type_name: string | null
+  linked_requirement: LinkedRequirementInfo
+  created_by_username: string | null
+  created_by_id: number | null
+  created_at: string | null
+}
+
+export interface RequirementSearchResult {
+  id: number
+  req_name: string
+  tag_code: string
+}
+
+export interface RequirementLinkCreateRequest {
+  relationship_type_id: number
+  target_requirement_id: number
+}
+
+class RelationshipService {
+  /**
+   * Get all relationship types for a project.
+   */
+  async getRelationshipTypes(projectId: number): Promise<RelationshipType[]> {
+    const response = await fetch(`${API_BASE_URL}/projects/${projectId}/relationship-types`, {
+      method: 'GET',
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    })
+
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`)
+    }
+
+    return await response.json()
+  }
+
+  /**
+   * Search requirements by name or tag code (for autocomplete).
+   */
+  async searchRequirements(
+    projectId: number,
+    query: string,
+    excludeId?: number
+  ): Promise<RequirementSearchResult[]> {
+    const params = new URLSearchParams({ q: query })
+    if (excludeId !== undefined) {
+      params.append('exclude_id', excludeId.toString())
+    }
+
+    const response = await fetch(
+      `${API_BASE_URL}/projects/${projectId}/requirements/search?${params}`,
+      {
+        method: 'GET',
+        credentials: 'include',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+      }
+    )
+
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`)
+    }
+
+    return await response.json()
+  }
+
+  /**
+   * Get all links for a requirement (both outgoing and incoming).
+   */
+  async getRequirementLinks(requirementId: number): Promise<RequirementLink[]> {
+    const response = await fetch(`${API_BASE_URL}/requirements/${requirementId}/links`, {
+      method: 'GET',
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    })
+
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`)
+    }
+
+    return await response.json()
+  }
+
+  /**
+   * Create a new link from a requirement to another.
+   */
+  async createLink(
+    requirementId: number,
+    data: RequirementLinkCreateRequest
+  ): Promise<RequirementLink> {
+    const response = await fetch(`${API_BASE_URL}/requirements/${requirementId}/links`, {
+      method: 'POST',
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(data),
+    })
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}))
+      throw new Error(errorData.detail || `HTTP error! status: ${response.status}`)
+    }
+
+    return await response.json()
+  }
+
+  /**
+   * Delete a requirement link.
+   */
+  async deleteLink(linkId: number): Promise<void> {
+    const response = await fetch(`${API_BASE_URL}/requirement-links/${linkId}`, {
+      method: 'DELETE',
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    })
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}))
+      throw new Error(errorData.detail || `HTTP error! status: ${response.status}`)
+    }
+  }
+}
+
+export const relationshipService = new RelationshipService()

frontend/src/types/auth.ts

@@ -4,6 +4,7 @@ export interface User {
   full_name: string | null
   role: string | null
   role_id: number | null
+  db_user_id: number | null
 }
 
 export interface AuthContextType {