diff --git a/backend/app/models/case_intelligence.py b/backend/app/models/case_intelligence.py
index 8999627..6dd56d4 100644
--- a/backend/app/models/case_intelligence.py
+++ b/backend/app/models/case_intelligence.py
@@ -56,10 +56,13 @@ class CaseHealthScore(Base):
 
     # Timestamps
     calculated_at = Column(DateTime(timezone=True), server_default=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case")
     user = relationship("User")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class CasePrediction(Base):
@@ -97,10 +100,13 @@ class CasePrediction(Base):
 
     # Timestamps
     predicted_at = Column(DateTime(timezone=True), server_default=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case")
     user = relationship("User")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class JudgeProfile(Base):
@@ -145,9 +151,12 @@ class JudgeProfile(Base):
 
     # Timestamps
     created_at = Column(DateTime(timezone=True), server_default=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     jurisdiction = relationship("Jurisdiction")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class CaseEvent(Base):
@@ -210,12 +219,15 @@ class CaseEvent(Base):
     # Timestamps
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case")
     user = relationship("User")
     document = relationship("Document")
     deadline = relationship("Deadline")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class DiscoveryRequest(Base):
@@ -266,11 +278,14 @@ class DiscoveryRequest(Base):
     # Timestamps
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case")
     user = relationship("User")
     deadline = relationship("Deadline")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class CaseFact(Base):
@@ -316,11 +331,14 @@ class CaseFact(Base):
 
     # Timestamps
     extracted_at = Column(DateTime(timezone=True), server_default=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case", foreign_keys=[case_id])
     user = relationship("User", foreign_keys=[user_id])
     source_document = relationship("Document")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
 
 
 class BriefDraft(Base):
@@ -373,9 +391,12 @@ class BriefDraft(Base):
     # Timestamps
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+    deleted_at = Column(DateTime(timezone=True))
+    updated_by = Column(String(36), ForeignKey("users.id", ondelete="SET NULL"))
 
     # Relationships
     case = relationship("Case")
     user = relationship("User")
     parent_draft = relationship("BriefDraft", remote_side=[id])
     final_document = relationship("Document")
+    updated_by_user = relationship("User", foreign_keys=[updated_by])
diff --git a/backend/supabase/migrations/007_add_case_intelligence_audit_columns.sql b/backend/supabase/migrations/007_add_case_intelligence_audit_columns.sql
new file mode 100644
index 0000000..571c63d
--- /dev/null
+++ b/backend/supabase/migrations/007_add_case_intelligence_audit_columns.sql
@@ -0,0 +1,90 @@
+-- Migration: Add soft-delete and audit columns to case intelligence tables
+-- Adds deleted_at and updated_by columns to all tables in case_intelligence.py
+
+-- ============================================
+-- CASE HEALTH SCORES TABLE
+-- ============================================
+ALTER TABLE case_health_scores 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- CASE PREDICTIONS TABLE
+-- ============================================
+ALTER TABLE case_predictions 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- JUDGE PROFILES TABLE
+-- ============================================
+ALTER TABLE judge_profiles 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- CASE EVENTS TABLE
+-- ============================================
+ALTER TABLE case_events 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- DISCOVERY REQUESTS TABLE
+-- ============================================
+ALTER TABLE discovery_requests 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- CASE FACTS TABLE
+-- ============================================
+ALTER TABLE case_facts 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- BRIEF DRAFTS TABLE
+-- ============================================
+ALTER TABLE brief_drafts 
+ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS updated_by VARCHAR(36) REFERENCES users(id) ON DELETE SET NULL;
+
+-- ============================================
+-- CREATE INDEXES FOR PERFORMANCE
+-- ============================================
+CREATE INDEX IF NOT EXISTS idx_case_health_scores_deleted_at ON case_health_scores(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_case_health_scores_updated_by ON case_health_scores(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_case_predictions_deleted_at ON case_predictions(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_case_predictions_updated_by ON case_predictions(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_judge_profiles_deleted_at ON judge_profiles(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_judge_profiles_updated_by ON judge_profiles(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_case_events_deleted_at ON case_events(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_case_events_updated_by ON case_events(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_discovery_requests_deleted_at ON discovery_requests(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_discovery_requests_updated_by ON discovery_requests(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_case_facts_deleted_at ON case_facts(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_case_facts_updated_by ON case_facts(updated_by);
+
+CREATE INDEX IF NOT EXISTS idx_brief_drafts_deleted_at ON brief_drafts(deleted_at) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_brief_drafts_updated_by ON brief_drafts(updated_by);
+
+-- ============================================
+-- ENABLE AUDIT TRIGGERS FOR NEW TABLES
+-- ============================================
+-- These tables may not exist yet, but when they do, they should be audited
+-- The enable_audit_for_table function is defined in 003_ironclad_audit_system.sql
+
+-- Enable auditing for case intelligence tables when they exist
+SELECT enable_audit_for_table('case_health_scores');
+SELECT enable_audit_for_table('case_predictions');
+SELECT enable_audit_for_table('judge_profiles');
+SELECT enable_audit_for_table('case_events');
+SELECT enable_audit_for_table('discovery_requests');
+SELECT enable_audit_for_table('case_facts');
+SELECT enable_audit_for_table('brief_drafts');
\ No newline at end of file