chore: update system requirements

Author: ArturWieczorek

Readme.md

@@ -48,20 +48,76 @@ The database schema is highly normalised which helps prevent data inconsistencie
 with the use of foreign keys from one table to another). More user friendly database queries can be
 implemented using [Postgres Views][PostgresView] to implement joins between tables.
 
-## System Requirements
+## System Requirements - May 2025
 
 The system requirements for `cardano-db-sync` (with both `db-sync` and the `node` running
 on the same machine are:
 
 * Any of the big well known Linux distributions (eg, Debian, Ubuntu, RHEL, CentOS, Arch
   etc).
-* 32 Gigabytes of RAM or more.
+* 64 Gigabytes of RAM or more (for `mainnet`).
 * 4 CPU cores or more.
 * Ensure that the machine has sufficient IOPS (Input/Output Operations per Second). Ie it should be
   60k IOPS or better. Lower IOPS ratings will result in slower sync times and/or falling behind the
   chain tip.
-* 320 Gigabytes or more of disk storage (preferably SSD which are 2-5 times faster than
-  electro-mechanical disks).
+* Disk storage - preferably SSD which are 2-5 times faster than electro-mechanical disks.
+
+
+Stats for configuration:
+
+```json
+  "insert_options": {
+    "tx_cbor": "disable",
+    "tx_out": {
+      "value": "enable",
+      "force_tx_in": false,
+      "use_address_table": false
+    },
+    "ledger": "enable",
+    "shelley": {
+      "enable": true
+    },
+    "multi_asset": {
+      "enable": true
+    },
+    "metadata": {
+      "enable": true
+    },
+    "plutus": {
+      "enable": true
+    },
+    "governance": "enable",
+    "offchain_pool_data": "enable",
+    "json_type": "text"
+  }
+```
+
+### `mainnet`
+
+- `cardano-node` database size: 203 GB
+- `cardano-db-sync` total ledger state files size: ~ 10 GB
+- `Postgres` database `mainnet_13.6.0.5` total size: 438 GB
+
+- `cardano-db-sync` RSS RAM: peaks at 20.6 GB before settling at 18.5 GB
+
+
+### `preprod`
+
+- `cardano-node` database size: 12 GB
+- `cardano-db-sync` total ledger state files size: ~ 2 GB
+- `Postgres` database `preprod_13.6.0.5` total size: 16 GB
+
+- `cardano-db-sync` RSS RAM: 3,5 GB
+
+
+### `preview`
+
+- `cardano-node` database size: 12 GB
+- `cardano-db-sync` total ledger state files size: ~ 2 GB
+- `Postgres` database `preview_13.6.0.5` total size: 21 GB
+
+- `cardano-db-sync` RSS RAM: 3,5 GB
+
 
 The recommended configuration is to have the `db-sync` and the PostgreSQL server on the same
 machine. During syncing (getting historical data from the blockchain) there is a **HUGE** amount