added duplicate check and database

app/models.py

@@ -1,7 +1,9 @@
+# app/models.py
 #!/usr/bin/env python3
 
-from .database import Base
-from sqlalchemy import Column, String, Integer
+from sqlalchemy import Column, String, Integer, DateTime, func
+from sqlalchemy.ext.declarative import declarative_base
+from app.database import Base
 
 class DocumentMetadata(Base):
     __tablename__ = "documents"
@@ -12,3 +14,35 @@ class DocumentMetadata(Base):
     recipient = Column(String)
     tags = Column(String)
     summary = Column(String)
+
+class FileRecord(Base):
+    __tablename__ = "files"
+
+    id = Column(Integer, primary_key=True, index=True)
+    
+    # Hash of the file content (e.g. SHA-256)
+    filehash = Column(String, unique=True, index=True, nullable=False)
+
+    # The name of the file as it was originally uploaded (if known)
+    original_filename = Column(String)
+
+    # The name/path we store on disk (e.g. /workdir/tmp/<uuid>.pdf)
+    local_filename = Column(String, nullable=False)
+
+    # Size of the file in bytes
+    file_size = Column(Integer, nullable=False)
+
+    # MIME type or extension (optional)
+    mime_type = Column(String)
+
+    # Timestamp when we inserted this record
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+class ProcessingLog(Base):
+    __tablename__ = "processing_logs"
+    id = Column(Integer, primary_key=True, index=True)
+    file_id = Column(Integer, ForeignKey("files.id"))
+    step_name = Column(String)       # e.g. "OCR", "convert_to_pdf", "upload_s3"
+    status = Column(String)          # "success" / "failure"
+    message = Column(String)         # error text or success note
+    timestamp = Column(DateTime(timezone=True), server_default=func.now())