Fix code formatting and linting issues

- Auto-format all Python files with black and isort
- Remove unused imports with autoflake
- Fix flake8 issues (missing newlines, blank lines, etc.)
- Fix nonlocal/global scope issues in main.py
- Fix security.py import order (E402)
- Remove f-string without placeholders
- Add nosec comment for intentional exception handling
- Fix test imports to match refactored DMARCParser API

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/models/report.py

@@ -1,91 +1,89 @@
 from datetime import datetime
-from typing import List, Optional
-
-from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text, Index
-from sqlalchemy.orm import relationship
 
 from app.core.database import Base
+from sqlalchemy import Column, DateTime, ForeignKey, Index, Integer, String, Text
+from sqlalchemy.orm import relationship
 
 
 class DMARCReport(Base):
     """DMARC Aggregate Report model"""
-    
+
     __tablename__ = "dmarc_reports"
-    
+
     id = Column(Integer, primary_key=True, index=True)
     domain_id = Column(Integer, ForeignKey("domains.id"), nullable=False, index=True)
-    
+
     # Report metadata
     report_id = Column(String, index=True, nullable=False)
     org_name = Column(String, nullable=False, index=True)
     begin_date = Column(Integer, nullable=False, index=True)  # Unix timestamp
     end_date = Column(Integer, nullable=False, index=True)  # Unix timestamp
     source_email = Column(String, nullable=True)
-    
+
     # Policy information
     policy = Column(String, nullable=True, index=True)  # none, quarantine, reject
     subdomain_policy = Column(String, nullable=True)
     adkim = Column(String(1), nullable=True)  # r (relaxed) or s (strict)
-    aspf = Column(String(1), nullable=True)   # r (relaxed) or s (strict)
+    aspf = Column(String(1), nullable=True)  # r (relaxed) or s (strict)
     percentage = Column(Integer, nullable=True)
-    
+
     # Processing metadata
     processed_at = Column(DateTime, default=datetime.utcnow, index=True)
     raw_data = Column(Text, nullable=True)  # Original XML content (optional)
-    
+
     # Relationships
     domain = relationship("Domain", back_populates="reports")
     records = relationship("ReportRecord", back_populates="report", cascade="all, delete-orphan")
-    
+
     # Indexes for common queries
     __table_args__ = (
         # Composite index for domain and date range queries (common dashboard queries)
-        Index('ix_dmarc_reports_domain_dates', 'domain_id', 'begin_date', 'end_date'),
+        Index("ix_dmarc_reports_domain_dates", "domain_id", "begin_date", "end_date"),
         # Index for finding reports by policy
-        Index('ix_dmarc_reports_policy', 'policy'),
+        Index("ix_dmarc_reports_policy", "policy"),
         # Index for finding recent reports (dashboard statistics)
-        Index('ix_dmarc_reports_processed', 'processed_at'),
+        Index("ix_dmarc_reports_processed", "processed_at"),
     )
-    
+
     def __repr__(self):
         return f"<DMARCReport {self.report_id} for {self.domain_id}>"
 
 
 class ReportRecord(Base):
     """Individual record within a DMARC report"""
-    
+
     __tablename__ = "report_records"
-    
+
     id = Column(Integer, primary_key=True, index=True)
     report_id = Column(Integer, ForeignKey("dmarc_reports.id"), nullable=False, index=True)
-    
+
     # Source information
     source_ip = Column(String, nullable=False, index=True)
     count = Column(Integer, nullable=False, default=0)
-    
+
     # Policy evaluation
     disposition = Column(String, nullable=False, index=True)  # none, quarantine, reject
     dkim = Column(String, nullable=True, index=True)  # pass, fail
-    spf = Column(String, nullable=True, index=True)   # pass, fail
-    
+    spf = Column(String, nullable=True, index=True)  # pass, fail
+
     # Identifiers
     header_from = Column(String, nullable=True, index=True)
     envelope_from = Column(String, nullable=True)
-    
+
     # Authentication details (optional JSON fields)
     dkim_auth_details = Column(Text, nullable=True)  # JSON array of DKIM results
-    spf_auth_details = Column(Text, nullable=True)   # JSON array of SPF results
-    
+    spf_auth_details = Column(Text, nullable=True)  # JSON array of SPF results
+
     # Relationships
     report = relationship("DMARCReport", back_populates="records")
-    
+
     # Indexes for common queries
     __table_args__ = (
         # Composite index for source IP and evaluation results (for filtering)
-        Index('ix_report_records_source_auth', 'source_ip', 'dkim', 'spf'),
+        Index("ix_report_records_source_auth", "source_ip", "dkim", "spf"),
         # Composite index for disposition and count (for statistics)
-        Index('ix_report_records_disposition', 'disposition', 'count'),
+        Index("ix_report_records_disposition", "disposition", "count"),
     )
-    
+
     def __repr__(self):
-        return f"<ReportRecord {self.id} ({self.source_ip})>"
+        return f"<ReportRecord {self.id} ({self.source_ip})>"