Small improvements on the mining page UX

- INDEXING_BLOCKS_AMOUNT = 0 disable indexing, INDEXING_BLOCKS_AMOUNT = -1 indexes everything
- Show only available timespan in the mining page according to available datas
- Change default INDEXING_BLOCKS_AMOUNT to 1100

Don't use unfiltered mysql user input

Enable http cache header for mining pools (1 min)

backend/src/repositories/PoolsRepository.ts

@@ -25,17 +25,20 @@ class PoolsRepository {
   /**
    * Get basic pool info and block count
    */
-  public async $getPoolsInfo(interval: string = '100 YEARS'): Promise<PoolInfo[]> {
-    const connection = await DB.pool.getConnection();
-    const [rows] = await connection.query(`
+  public async $getPoolsInfo(interval: string | null): Promise<PoolInfo[]> {
+    const query = `
       SELECT COUNT(height) as blockCount, pool_id as poolId, pools.name as name, pools.link as link
       FROM blocks
-      JOIN pools on pools.id = pool_id
-      WHERE blocks.blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()
-      GROUP BY pool_id
-      ORDER BY COUNT(height) DESC;
-    `);
+      JOIN pools on pools.id = pool_id` +
+      (interval != null ? ` WHERE blocks.blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()` : ``) +
+      ` GROUP BY pool_id
+      ORDER BY COUNT(height) DESC
+    `;
+
+    const connection = await DB.pool.getConnection();
+    const [rows] = await connection.query(query);
     connection.release();
+
     return <PoolInfo[]>rows;
   }
 }