add back type checkers

Author: eakmanrq

sqlmesh/core/config/root.py

@@ -44,7 +44,30 @@
 from sqlmesh.core.user import User
 from sqlmesh.utils.date import to_timestamp, now
 from sqlmesh.utils.errors import ConfigError
-from sqlmesh.utils.pydantic import model_validator, field_validator
+from sqlmesh.utils.pydantic import model_validator
+
+
+def validate_no_past_ttl(v: str) -> str:
+    current_time = now()
+    if to_timestamp(v, relative_base=current_time) < to_timestamp(current_time):
+        raise ValueError(
+            f"TTL '{v}' is in the past. Please specify a relative time in the future. Ex: `in 1 week` instead of `1 week`."
+        )
+    return v
+
+
+def gateways_ensure_dict(value: t.Dict[str, t.Any]) -> t.Dict[str, t.Any]:
+    try:
+        if not isinstance(value, GatewayConfig):
+            GatewayConfig.parse_obj(value)
+        return {"": value}
+    except Exception:
+        return value
+
+
+def validate_regex_key_dict(value: t.Dict[str | re.Pattern, t.Any]) -> t.Dict[re.Pattern, t.Any]:
+    return compile_regex_mapping(value)
+
 
 
 def validate_no_past_ttl(v: str) -> str: