Implement Base DAO and Repository Utilities

[teogor]

Description

To reduce boilerplate in KMP projects, stitch should provide standard base interfaces for DAOs and utilities for Repositories. This ensures a consistent pattern for common operations like Insert, Update, and Delete.

Technical Analysis

A BaseDao<T> allows developers to inherit standard CRUD operations without redefining them for every entity. Repositories can then benefit from generic extensions to handle database interactions safely.

Proposed Implementation

1. BaseDao Interface:

   interface BaseDao<T> {
     @Insert
     suspend fun insert(entity: T)
   
     @Insert
     suspend fun insert(vararg entities: T)
   
     @Update
     suspend fun update(entity: T)
   
     @Delete
     suspend fun delete(entity: T)
   }

2. Repository Utilities:
   Introduce a way to wrap DAO calls with error handling or logging.

   abstract class StitchRepository(private val db: RoomDatabase) {
     protected suspend fun <R> dbCall(block: suspend () -> R): R {
       return try {
         block()
       } catch (e: Exception) {
         // Standardized logging or error mapping
         throw e
       }
     }
   }

Goals

• Create BaseDao<T> in the stitch-runtime module.
• Provide documentation and base classes for Repository patterns in KMP.