diff --git a/agent-framework/prometheus_swarm/database/models.py b/agent-framework/prometheus_swarm/database/models.py
index 5a4785aa..58d30260 100644
--- a/agent-framework/prometheus_swarm/database/models.py
+++ b/agent-framework/prometheus_swarm/database/models.py
@@ -2,8 +2,9 @@
 
 from datetime import datetime
 from typing import Optional, List
-from sqlmodel import SQLModel, Field, Relationship
-
+from sqlmodel import SQLModel, Field, Relationship, Column, UniqueConstraint
+from sqlalchemy import CheckConstraint
+from pydantic import field_validator, constr, ConfigDict
 
 class Conversation(SQLModel, table=True):
     """Conversation model."""
@@ -42,3 +43,34 @@ class Log(SQLModel, table=True):
     stack_trace: Optional[str] = None
     request_id: Optional[str] = None
     additional_data: Optional[str] = None
+
+
+class Evidence(SQLModel, table=True):
+    """Evidence model to ensure uniqueness."""
+
+    __tablename__ = 'evidence'
+    
+    model_config = ConfigDict(
+        validate_assignment=True,
+        from_attributes=True
+    )
+    
+    id: Optional[int] = Field(default=None, primary_key=True)
+    content: str = Field(min_length=1, max_length=10000)
+    type: str = Field(index=True)
+    created_at: datetime = Field(default_factory=datetime.utcnow)
+    
+    __table_args__ = (
+        UniqueConstraint('content', 'type', name='uix_evidence_content_type'),
+    )
+    
+    @field_validator('content')
+    @classmethod
+    def validate_non_empty(cls, v):
+        """Validate content is not just whitespace"""
+        if not isinstance(v, str):
+            raise ValueError("Content must be a string")
+        v = v.strip()
+        if not v:
+            raise ValueError("Content cannot be empty or just whitespace")
+        return v
\ No newline at end of file
diff --git a/agent-framework/prometheus_swarm/tests/__init__.py b/agent-framework/prometheus_swarm/tests/__init__.py
new file mode 100644
index 00000000..739954cb
--- /dev/null
+++ b/agent-framework/prometheus_swarm/tests/__init__.py
@@ -0,0 +1 @@
+# Tests package
\ No newline at end of file
diff --git a/agent-framework/prometheus_swarm/tests/integration/__init__.py b/agent-framework/prometheus_swarm/tests/integration/__init__.py
new file mode 100644
index 00000000..e27cd7ab
--- /dev/null
+++ b/agent-framework/prometheus_swarm/tests/integration/__init__.py
@@ -0,0 +1 @@
+# Integration tests package
\ No newline at end of file
diff --git a/agent-framework/prometheus_swarm/tests/integration/test_evidence_uniqueness.py b/agent-framework/prometheus_swarm/tests/integration/test_evidence_uniqueness.py
new file mode 100644
index 00000000..2e22c1f0
--- /dev/null
+++ b/agent-framework/prometheus_swarm/tests/integration/test_evidence_uniqueness.py
@@ -0,0 +1,83 @@
+import pytest
+from sqlmodel import SQLModel, create_engine, Session, select
+from prometheus_swarm.database.models import Evidence
+from pydantic import ValidationError
+
+def create_test_engine():
+    """Create an in-memory SQLite engine for testing."""
+    # Using SQLite in-memory database for testing
+    return create_engine("sqlite:///:memory:", connect_args={"check_same_thread": False})
+
+def test_evidence_uniqueness():
+    """
+    Integration test to verify evidence uniqueness across the system.
+    
+    This test ensures that:
+    1. Duplicate evidence with same type cannot be inserted
+    2. Each evidence entry has a unique identifier
+    3. Constraints prevent duplicate evidence submissions
+    """
+    # Create test engine and tables
+    engine = create_test_engine()
+    SQLModel.metadata.create_all(engine)
+    
+    def create_evidence(session: Session, content: str, type: str) -> Evidence:
+        """Helper function to create evidence entries"""
+        evidence = Evidence(content=content, type=type)
+        session.add(evidence)
+        session.commit()
+        return evidence
+
+    with Session(engine) as session:
+        # First evidence submission should succeed
+        evidence1 = create_evidence(session, "Test Content 1", "test_type")
+        assert evidence1.id is not None
+        
+        # Attempt to insert identical evidence should fail
+        with pytest.raises(Exception) as excinfo:
+            create_evidence(session, "Test Content 1", "test_type")
+        
+        assert "UNIQUE constraint" in str(excinfo.value)
+
+def test_evidence_multiple_types():
+    """
+    Test that different types of evidence can have the same content
+    """
+    engine = create_test_engine()
+    SQLModel.metadata.create_all(engine)
+    
+    with Session(engine) as session:
+        # Create evidence with same content, different types
+        evidence1 = Evidence(content="Shared Content", type="type1")
+        evidence2 = Evidence(content="Shared Content", type="type2")
+        
+        session.add(evidence1)
+        session.add(evidence2)
+        session.commit()
+        
+        # Verify both evidences were saved
+        saved_evidences = session.exec(select(Evidence).where(Evidence.content == "Shared Content")).all()
+        assert len(saved_evidences) == 2
+        assert {e.type for e in saved_evidences} == {"type1", "type2"}
+
+def test_evidence_content_validation():
+    """
+    Test validation of evidence content
+    """
+    # Test empty content
+    with pytest.raises(ValidationError) as excinfo:
+        Evidence(content="", type="test_type")
+    assert "String should have at least 1 character" in str(excinfo.value)
+    
+    # Whitespace-only content
+    with pytest.raises(ValidationError) as excinfo:
+        Evidence(content="   ", type="test_type")
+    assert "Content cannot be empty or just whitespace" in str(excinfo.value)
+    
+    # Test very long content
+    long_content = "a" * 10001  # Exceeding max length
+    with pytest.raises(ValidationError) as excinfo:
+        Evidence(content=long_content, type="test_type")
+    
+    # Validate content cannot be completely empty or too long
+    assert "String should have at most" in str(excinfo.value)
\ No newline at end of file