FreeDATA/modem/message_system_db_model.py

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# models.py
from sqlalchemy import Index, Column, String, Integer, JSON, ForeignKey, DateTime
from sqlalchemy.orm import declarative_base, relationship
Base = declarative_base()
class Beacon(Base):
__tablename__ = 'beacon'
id = Column(Integer, primary_key=True)
timestamp = Column(DateTime)
snr = Column(Integer)
callsign = Column(String, ForeignKey('station.callsign'))
station = relationship("Station", back_populates="beacons")
Index('idx_beacon_callsign', 'callsign')
class Station(Base):
__tablename__ = 'station'
callsign = Column(String, primary_key=True)
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checksum = Column(String, nullable=True)
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location = Column(JSON, nullable=True)
info = Column(JSON, nullable=True)
beacons = relationship("Beacon", order_by="Beacon.id", back_populates="station")
Index('idx_station_callsign_checksum', 'callsign', 'checksum')
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def to_dict(self):
return {
'callsign': self.callsign,
'checksum': self.checksum,
'location': self.location,
'info': self.info,
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}
class Status(Base):
__tablename__ = 'status'
id = Column(Integer, primary_key=True)
name = Column(String, unique=True)
class P2PMessage(Base):
__tablename__ = 'p2p_message'
id = Column(String, primary_key=True)
origin_callsign = Column(String, ForeignKey('station.callsign'))
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via_callsign = Column(String, ForeignKey('station.callsign'), nullable=True)
destination_callsign = Column(String, ForeignKey('station.callsign'))
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body = Column(String, nullable=True)
attachments = relationship('Attachment', backref='p2p_message')
timestamp = Column(DateTime)
status_id = Column(Integer, ForeignKey('status.id'), nullable=True)
status = relationship('Status', backref='p2p_messages')
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direction = Column(String)
statistics = Column(JSON, nullable=True)
Index('idx_p2p_message_origin_timestamp', 'origin_callsign', 'via_callsign', 'destination_callsign', 'timestamp', 'attachments')
def to_dict(self):
return {
'id': self.id,
'timestamp': self.timestamp.isoformat() if self.timestamp else None,
'origin': self.origin_callsign,
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'via': self.via_callsign,
'destination': self.destination_callsign,
'direction': self.direction,
'body': self.body,
'attachments': [attachment.to_dict() for attachment in self.attachments],
'status': self.status.name if self.status else None,
'statistics': self.statistics
}
class Attachment(Base):
__tablename__ = 'attachment'
id = Column(Integer, primary_key=True)
name = Column(String)
data_type = Column(String)
data = Column(String)
message_id = Column(String, ForeignKey('p2p_message.id'))
Index('idx_attachments_id_message_id', 'id', 'message_id')
def to_dict(self):
return {
'id': self.id,
'name': self.name,
'data_type': self.data_type,
'data': self.data # Be cautious with large binary data
}