fix(pkg/db): create or upgrade postgres schema based on semver

pkg/db/sql/psql/schema/v0.1.0.sql

@@ -3,6 +3,7 @@ DROP TABLE IF EXISTS sensors CASCADE;
 DROP TABLE IF EXISTS humidities CASCADE;
 DROP TABLE IF EXISTS pressures CASCADE;
 DROP TABLE IF EXISTS temperatures CASCADE;
+DROP TABLE IF EXISTS info CASCADE;
 
 
 -- +----------------------------------------+
@@ -61,6 +62,11 @@ CREATE TABLE IF NOT EXISTS temperatures (
   update_date             TIMESTAMP WITH TIME ZONE
 );
 
+CREATE TABLE IF NOT EXISTS info (
+  key                     VARCHAR(32)                                             CONSTRAINT pk_info PRIMARY KEY,
+  value                   VARCHAR(32)                                             NOT NULL
+);
+
 -- +----------------------------------------+
 -- |               FOREIGN-KEYS             |
 -- +----------------------------------------+