Notification Schema Every notification is a structured record created before any delivery is attempted: notification_id: UUID or Snowflake — unique […]
Device Token Storage A device token is a provider-issued opaque string that identifies a specific app install on a specific
Message Schema Every message is a structured record stored durably before any delivery is attempted: message_id: Snowflake ID — 64-bit
WebRTC Overview WebRTC (Web Real-Time Communication) is a browser and native SDK standard for peer-to-peer audio and video. It handles
Ingestion Pipeline Raw video files uploaded by content creators or production teams enter a processing pipeline before they can be
Use Cases Vector search powers applications where semantic similarity matters more than keyword overlap: semantic search over documents, recommendation retrieval
Pipeline Stages Overview An ML training pipeline moves data through a sequence of well-defined stages: data ingestion, feature engineering, model
Double-Entry Bookkeeping Every financial transaction in the system uses double-entry bookkeeping: each transaction debits one or more accounts and credits
Contact Schema A contact represents a person or organization owned by a user. Multi-value fields (phones, emails, addresses) are stored
Event Schema The event is the core entity. It supports single and recurring events, multiple attendees, and rich metadata: events
Form Schema A form is defined as a document with ordered questions, each with a type and optional configuration: forms
Work Breakdown Structure The project hierarchy flows from top to bottom: Project → Epics → Stories → Tasks. Each node
Database Proxy Low-Level Design A database proxy sits in the network path between application servers and the database. It multiplexes
Query Cache Low-Level Design A query cache stores database query results in fast storage (typically Redis) so repeated identical queries
Data Import Service Low-Level Design A data import service ingests user-supplied files into the system's database. The main challenges are:
