feat: SQLAlchemy 모델 및 스키마 파일 생성 완료

- database.py: PostgreSQL 연결 설정 및 세션 관리
- models.py: Project, File, Material SQLAlchemy 모델 정의
- schemas.py: Pydantic 요청/응답 스키마 정의
- 완전한 데이터베이스 연동 구조 완성

backend/app/database.py

@@ -0,0 +1,24 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+
+# 데이터베이스 URL
+DATABASE_URL = "postgresql://tkmp_user:tkmp_password_2025@localhost:5432/tk_mp_bom"
+
+# SQLAlchemy 엔진 생성
+engine = create_engine(DATABASE_URL)
+
+# 세션 팩토리 생성
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Base 클래스 생성
+Base = declarative_base()
+
+# 데이터베이스 의존성 함수
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

backend/app/models.py

@@ -0,0 +1,74 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Text, Numeric, ForeignKey
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import relationship
+from datetime import datetime
+
+Base = declarative_base()
+
+class Project(Base):
+    __tablename__ = "projects"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    official_project_code = Column(String(50), unique=True, index=True)
+    project_name = Column(String(200), nullable=False)
+    client_name = Column(String(100))
+    design_project_code = Column(String(50))
+    design_project_name = Column(String(200))
+    is_code_matched = Column(Boolean, default=False)
+    matched_by = Column(String(100))
+    matched_at = Column(DateTime)
+    status = Column(String(20), default='active')
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow)
+    description = Column(Text)
+    notes = Column(Text)
+    
+    # 관계 설정
+    files = relationship("File", back_populates="project")
+
+class File(Base):
+    __tablename__ = "files"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    project_id = Column(Integer, ForeignKey("projects.id"))
+    filename = Column(String(255), nullable=False)
+    original_filename = Column(String(255), nullable=False)
+    file_path = Column(String(500), nullable=False)
+    revision = Column(String(20), default='Rev.0')
+    upload_date = Column(DateTime, default=datetime.utcnow)
+    uploaded_by = Column(String(100))
+    file_type = Column(String(10))
+    file_size = Column(Integer)
+    is_active = Column(Boolean, default=True)
+    
+    # 관계 설정
+    project = relationship("Project", back_populates="files")
+    materials = relationship("Material", back_populates="file")
+
+class Material(Base):
+    __tablename__ = "materials"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    file_id = Column(Integer, ForeignKey("files.id"))
+    line_number = Column(Integer)
+    original_description = Column(Text, nullable=False)
+    classified_category = Column(String(50))
+    classified_subcategory = Column(String(100))
+    material_grade = Column(String(50))
+    schedule = Column(String(20))
+    size_spec = Column(String(50))
+    quantity = Column(Numeric(10, 3), nullable=False)
+    unit = Column(String(10), nullable=False)
+    drawing_name = Column(String(100))
+    area_code = Column(String(20))
+    line_no = Column(String(50))
+    classification_confidence = Column(Numeric(3, 2))
+    is_verified = Column(Boolean, default=False)
+    verified_by = Column(String(100))
+    verified_at = Column(DateTime)
+    drawing_reference = Column(String(100))
+    notes = Column(Text)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    
+    # 관계 설정
+    file = relationship("File", back_populates="materials")

backend/app/schemas.py

@@ -0,0 +1,36 @@
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+from decimal import Decimal
+
+# 프로젝트 스키마
+class ProjectBase(BaseModel):
+    official_project_code: Optional[str] = None
+    project_name: str
+    client_name: Optional[str] = None
+    design_project_code: Optional[str] = None
+    design_project_name: Optional[str] = None
+    description: Optional[str] = None
+    notes: Optional[str] = None
+
+class ProjectCreate(ProjectBase):
+    pass
+
+class ProjectUpdate(ProjectBase):
+    project_name: Optional[str] = None
+
+class Project(ProjectBase):
+    id: int
+    is_code_matched: bool
+    status: str
+    created_at: datetime
+    updated_at: datetime
+    
+    class Config:
+        from_attributes = True
+
+# 응답 스키마
+class ProjectResponse(BaseModel):
+    projects: List[Project]
+    total: int
+    message: str