fix: address codex review for PR0 (design)

- Fix import ordering in utils.py (isort compliance)
- Simplify validation prefix key rewriting to mirror executor logic
- Normalize single-element list prefixes in normalize_target_schema_to_patch

Author: nkanu17

redisvl/migration/planner.py

@@ -212,7 +212,15 @@ def normalize_target_schema_to_patch(
 
         for index_key, target_value in target_dict["index"].items():
             source_value = source_dict["index"].get(index_key)
-            if source_value != target_value:
+            # Normalize single-element list prefixes for comparison so that
+            # e.g. source ["docs"] and target "docs" are treated as equal.
+            sv, tv = source_value, target_value
+            if index_key == "prefix":
+                if isinstance(sv, list) and len(sv) == 1:
+                    sv = sv[0]
+                if isinstance(tv, list) and len(tv) == 1:
+                    tv = tv[0]
+            if sv != tv:
                 changes["index"][index_key] = target_value
 
         return SchemaPatch.model_validate({"version": 1, "changes": changes})

redisvl/migration/utils.py

@@ -7,10 +7,6 @@
 
 import yaml
 
-from redisvl.utils.log import get_logger
-
-logger = get_logger(__name__)
-
 from redisvl.index import SearchIndex
 from redisvl.migration.models import (
     AOF_HSET_OVERHEAD_BYTES,
@@ -24,6 +20,9 @@
 )
 from redisvl.redis.connection import RedisConnectionFactory
 from redisvl.schema.schema import IndexSchema
+from redisvl.utils.log import get_logger
+
+logger = get_logger(__name__)
 
 
 def list_indexes(

redisvl/migration/validation.py

@@ -61,14 +61,12 @@ def validate(
             if plan.rename_operations.change_prefix is not None:
                 old_prefix = plan.source.keyspace.prefixes[0]
                 new_prefix = plan.rename_operations.change_prefix
-                key_sep = plan.source.keyspace.key_separator
-                # Normalize prefixes: strip trailing separator for consistent slicing
-                old_base = old_prefix.rstrip(key_sep) if old_prefix else ""
-                new_base = new_prefix.rstrip(key_sep) if new_prefix else ""
+                # Mirror executor logic exactly:
+                #   new_key = new_prefix + key[len(old_prefix):]
                 keys_to_check = []
                 for k in key_sample:
-                    if old_base and k.startswith(old_base):
-                        keys_to_check.append(new_base + k[len(old_base) :])
+                    if k.startswith(old_prefix):
+                        keys_to_check.append(new_prefix + k[len(old_prefix) :])
                     else:
                         keys_to_check.append(k)
             existing_count = target_index.client.exists(*keys_to_check)