issue #64 - missing entry from datatype maps.

coro/db/postgres/postgres.py

@@ -1121,6 +1121,9 @@ def decode_bytea(x):
 decode_type_map = {}
 decode_type_names = {}
 
+# NOTE: there is a table built into postgres with these values.
+# Try "select typname, typelem from pg_catalog.pg_type"
+
 for oid, cast, name in (
     (16, decode_bool, 'bool'),
     (17, decode_bytea, 'bytea'),
@@ -1140,6 +1143,7 @@ for oid, cast, name in (
     (701, float, 'float8'),
     (1007, decode_int_array, 'int4[]'),
     (1009, decode_str_array, 'text[]'),
+    (1700, int, 'numeric')
 ):
     decode_type_map[oid] = cast
     decode_type_names[oid] = name