Added a simple database migration tool.

Gotta remember to remove it again when the old python code is gone.

tools/migration.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+
+# Simple script to migrate the old python database to the new one for Go.
+
+OLDDB=""
+NEWDB=""
+OPTIND=1
+while getopts "o:n:h?" opt; do
+    case "$opt" in
+    o)
+        OLDDB="$OPTARG"
+        ;;
+    n)
+        NEWDB="$OPTARG"
+        ;;
+    h|?)
+        echo "Usage options:"
+        echo -e "-h, -?\t\tShow this help and exit"
+        echo -e "-o <file>\tOld database file to dump data from (required)"
+        echo -e "-n <file>\tNew database file to insert data into (required)"
+        exit 0
+        ;;
+    esac
+done
+
+if [[ ! -f "$OLDDB" || ! -f "$NEWDB" ]]; then
+    echo "Missing database files!"
+    exit 1
+fi
+
+
+TEMPFILE=$(tempfile)
+read -d "" TMP << EOF
+PRAGMA foreign_keys = ON;
+
+DROP TABLE IF EXISTS "server";
+DROP TABLE IF EXISTS "server_history";
+
+CREATE TABLE "servers" ("id" integer primary key autoincrement,"last_updated" datetime,"title" varchar(64)  UNIQUE,"game_url" varchar(255),"site_url" varchar(255),"players_current" integer,"players_avg" integer,"players_min" integer,"players_max" integer,"players_mon" integer,"players_tue" integer,"players_wed" integer,"players_thu" integer,"players_fri" integer,"players_sat" integer,"players_sun" integer );
+CREATE TABLE "server_populations" ("id" integer primary key autoincrement,"timestamp" datetime,"players" integer,"server_id" integer REFERENCES servers(id) ON DELETE CASCADE ON UPDATE CASCADE );
+CREATE INDEX idx_server_populations_server_id ON "server_populations"("server_id") ;
+
+BEGIN TRANSACTION;
+EOF
+echo "$TMP" > "$TEMPFILE"
+
+read -d "" TMP << EOF
+.mode insert
+select
+    id,
+    last_updated,
+    title,
+    game_url,
+    site_url,
+    players_current,
+    players_avg,
+    players_min,
+    players_max,
+    0,0,0,0,0,0,0
+from gameservers_server;
+EOF
+echo "$TMP" | sqlite3 "$OLDDB" | sed 's/table/servers/g' >> "$TEMPFILE"
+
+read -d "" TMP << EOF
+.mode insert
+select
+    id,
+    created,
+    players,
+    server_id
+from gameservers_serverhistory;
+EOF
+echo "$TMP" | sqlite3 "$OLDDB" | sed 's/table/server_populations/g' >> "$TEMPFILE"
+echo "COMMIT;" >> "$TEMPFILE"
+
+
+sqlite3 "$NEWDB" < "$TEMPFILE"
+rm "$TEMPFILE"