Add stations table definiton.

schema.sql

@@ -50,3 +50,12 @@ CREATE TABLE frames (
     weather TEXT,
     wx_raw_timestamp TIMESTAMP
 );
+
+CREATE TABLE "stations" (
+	"id"	INTEGER NOT NULL UNIQUE,
+	"from"	TEXT UNIQUE,
+	"frames_id"	INTEGER,
+	"last_heard_unix"	INTEGER,
+	"count"	INTEGER,
+	PRIMARY KEY("id" AUTOINCREMENT)
+);