refactor: replace per-dialect extractors with generic extractor

Collapse the mssql- and postgres-specific extractors into a single generic implementation driven by the DB dialect interface.

config.yaml

@@ -50,16 +50,25 @@ jobs:
       post_sql: 
         - "SELECT 1"
 
-  - name: storage_attachments
+  - name: analytics_audit_log
     source:
-      schema: analytics
+      schema: storage
       table: attachments
       primary_key: id
     target:
-      schema: analytics
+      schema: storage
       table: attachments
     to_storage:
       columns:
         - source: DATA
           target: FILE_URL
-          mode: REFERENCE_ONLY # REFERENCE_ONLY | DUPLICATE_WITH_REF
+          mode: REFERENCE_ONLY
+    max_extractors: 8
+    max_loaders: 4
+    queue_size: 32
+    batch_size: 1
+    retry:
+      attempts: 5
+      base_delay_ms: 1000
+      max_delay_ms: 15000
+      max_jitter_ms: 500