add drug dosages parsing, add postgres db

src/database.py

@@ -0,0 +1,21 @@
+from sqlalchemy import BigInteger, Column, MetaData, String, Float, Text
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine
+from src.config import settings
+
+class Base(DeclarativeBase):
+    metadata = MetaData()
+
+class Drug(Base):
+    __tablename__ = "drugs"
+    
+    id = Column(BigInteger, primary_key=True, index=True)
+    name = Column(String, nullable=False, index=True)
+    dosage = Column(Float, nullable=False)
+    dosage_unit = Column(String, nullable=False)
+    unit_price = Column(Float, nullable=False)
+    description = Column(Text, nullable=True)
+
+engine = create_engine(settings.DATABASE_URL)
+Session = sessionmaker(autocommit=False, autoflush=False, bind=engine)