diff --git a/data/seed/aws_pricelist_seed.json b/data/seed/aws_pricelist_seed.json
index dfc4bc9..315ce57 100644
--- a/data/seed/aws_pricelist_seed.json
+++ b/data/seed/aws_pricelist_seed.json
@@ -68,7 +68,6 @@
   {"vendor": "aws", "service": "AmazonALB", "region": "us-east-1", "usage_metric": "ALB-LCU-NewConnections", "unit": "LCU-Hours", "price_usd": 0.008, "source": "seed", "description": "ALB LCU new connections pricing ($0.008 per LCU-hour, 1 LCU = 25 new connections/sec)"},
   {"vendor": "aws", "service": "AmazonALB", "region": "us-east-1", "usage_metric": "ALB-LCU-ActiveConnections", "unit": "LCU-Hours", "price_usd": 0.008, "source": "seed", "description": "ALB LCU active connections pricing ($0.008 per LCU-hour, 1 LCU = 3000 active)"},
   {"vendor": "aws", "service": "AmazonALB", "region": "us-east-1", "usage_metric": "ALB-LCU-RuleEvaluations", "unit": "LCU-Hours", "price_usd": 0.008, "source": "seed", "description": "ALB LCU rule evaluations pricing ($0.008 per LCU-hour, 1 LCU = 1000 rules/sec)"},
-  {"vendor": "aws", "service": "AmazonCloudWatch", "region": "us-east-1", "usage_metric": "CloudWatch-Log-Storage", "unit": "GB-Mo", "price_usd": 0.03, "source": "seed", "description": "CloudWatch Logs storage pricing ($0.03 per GB-month stored)"},
   {"vendor": "aws", "service": "AmazonVPC", "region": "us-east-1", "usage_metric": "NAT-Gateway-Hour", "unit": "Hours", "price_usd": 0.045, "source": "seed", "description": "NAT Gateway hourly pricing ($0.045 per NAT-hour)"},
   {"vendor": "aws", "service": "AmazonVPC", "region": "us-east-1", "usage_metric": "NAT-Gateway-DataProcessed", "unit": "GB", "price_usd": 0.045, "source": "seed", "description": "NAT Gateway data processing pricing ($0.045 per GB processed)"},
   {"vendor": "aws", "service": "AmazonVPC", "region": "us-east-1", "usage_metric": "VPC-Endpoint-Hour", "unit": "Hours", "price_usd": 0.01, "source": "seed", "description": "VPC Interface Endpoint hourly pricing ($0.01 per ENI-hour)"},
diff --git a/infra_cost_model/pricing/sources/infracost.py b/infra_cost_model/pricing/sources/infracost.py
index 6911fc9..87b78ea 100644
--- a/infra_cost_model/pricing/sources/infracost.py
+++ b/infra_cost_model/pricing/sources/infracost.py
@@ -79,7 +79,7 @@ def _to_float(value) -> Optional[float]:
     "eu-west-1": "EU", "eu-west-2": "EUW2", "eu-west-3": "EUW3",
     "eu-central-1": "EUC1", "eu-central-2": "EUC2", "eu-north-1": "EUN1",
     "eu-south-1": "EUS1", "eu-south-2": "EUS2",
-    "ap-southeast-1": "APS1", "ap-southeast-2": "APS2", "ap-southeast-3": "APS3",
+    "ap-southeast-1": "APS1", "ap-southeast-2": "APS2", "ap-southeast-3": "APS4",
     "ap-south-1": "APS3", "ap-south-2": "APS5",
     "ap-northeast-1": "APN1", "ap-northeast-2": "APN2", "ap-northeast-3": "APN3",
     "ap-east-1": "APE1",
diff --git a/infra_cost_model/resources/registry.py b/infra_cost_model/resources/registry.py
index c9db70e..32b20fb 100644
--- a/infra_cost_model/resources/registry.py
+++ b/infra_cost_model/resources/registry.py
@@ -78,8 +78,7 @@ def _infer_provider(cls, resource_type: Type[ResourceType]) -> Optional[str]:
                 "alb": "aws",
                 "networking": "aws",
                 "cloudwatch": "aws",
-                "rds": "aws",
-                "rds": "aws", "misc_services": "aws",
+                "misc_services": "aws",
                 "kms": "aws",
                 "data_transfer": "aws",
                 "gcp": "gcp", "azure": "azure",
diff --git a/tests/test_infracost_client.py b/tests/test_infracost_client.py
index 8177f1e..9677fe1 100644
--- a/tests/test_infracost_client.py
+++ b/tests/test_infracost_client.py
@@ -416,3 +416,23 @@ def test_regionless_usagetype_unknown_region_upserts_nothing(monkeypatch):
             cache, "DataTransfer-Internet-Out-GB", "moon-base-1")
     assert n == 0
     cache.upsert.assert_not_called()
+
+
+# --- Region usagetype prefix map integrity -------------------------------------
+
+def test_region_usagetype_prefixes_are_unique():
+    """Each region must map to a DISTINCT usagetype prefix — a collision makes two
+    regions' prices indistinguishable in the usagetype filters (e.g. the data-
+    transfer region-pair / regionless sync)."""
+    from collections import Counter
+    from infra_cost_model.pricing.sources.infracost import _REGION_PREFIX
+    dupes = {v: n for v, n in Counter(_REGION_PREFIX.values()).items() if n > 1}
+    assert not dupes, f"duplicate region usagetype prefixes: {dupes}"
+
+
+def test_ap_region_prefixes_match_aws_codes():
+    """AWS assigns usage-type region codes by launch order, not name."""
+    from infra_cost_model.pricing.sources.infracost import _REGION_PREFIX
+    assert _REGION_PREFIX["ap-south-1"] == "APS3"      # Mumbai
+    assert _REGION_PREFIX["ap-southeast-3"] == "APS4"  # Jakarta
+    assert _REGION_PREFIX["ap-south-2"] == "APS5"      # Hyderabad
diff --git a/tests/test_pricing.py b/tests/test_pricing.py
index 5206295..f11ae4a 100644
--- a/tests/test_pricing.py
+++ b/tests/test_pricing.py
@@ -276,3 +276,18 @@ def test_seed_prices_is_idempotent():
 
         assert count_once > 0
         assert count_twice == count_once
+
+
+def test_seed_pricelist_has_no_duplicate_rows():
+    """The bundled seed list must not carry duplicate price rows: SQLite treats
+    seed rows (purchase_option=NULL) as distinct under the UNIQUE constraint, so a
+    dup would load twice and a single logical price could return as a spurious
+    multi-tier TieredPrice."""
+    import json
+    from collections import Counter
+    from infra_cost_model.pricing.cache import SEED_PRICES_PATH
+    rows = json.loads(SEED_PRICES_PATH.read_text())
+    keys = [(r["vendor"], r["service"], r["region"], r["usage_metric"],
+             r.get("start_usage_amount")) for r in rows]
+    dupes = {k: n for k, n in Counter(keys).items() if n > 1}
+    assert not dupes, f"duplicate seed rows: {dupes}"