feat: custom pricing

closes #3

lnvps_db/migrations/20250306113236_custom_pricing.sql

@@ -0,0 +1,49 @@
+-- fix this fk ref
+ALTER TABLE vm_template DROP FOREIGN KEY fk_template_region;
+alter table vm_template
+    add constraint fk_template_region foreign key (region_id) references vm_host_region (id);
+
+create table vm_custom_pricing
+(
+    id          integer unsigned not null auto_increment primary key,
+    name        varchar(100) not null,
+    enabled     bit(1)       not null,
+    created     timestamp default current_timestamp,
+    expires     timestamp,
+    region_id   integer unsigned not null,
+    currency    varchar(5)   not null,
+    cpu_cost    float        not null,
+    memory_cost float        not null,
+    ip4_cost    float        not null,
+    ip6_cost    float        not null,
+
+    constraint fk_custom_pricing_region foreign key (region_id) references vm_host_region (id)
+);
+create table vm_custom_pricing_disk
+(
+    id         integer unsigned not null auto_increment primary key,
+    pricing_id integer unsigned not null,
+    kind       smallint unsigned not null,
+    interface  smallint unsigned not null,
+    cost       float not null,
+
+    constraint fk_custom_pricing_disk foreign key (pricing_id) references vm_custom_pricing (id)
+);
+ALTER TABLE vm MODIFY COLUMN template_id int (10) unsigned NULL;
+ALTER TABLE vm
+    add COLUMN custom_template_id int(10) unsigned NULL;
+
+create table vm_custom_template
+(
+    id             integer unsigned not null auto_increment primary key,
+    cpu            tinyint unsigned not null,
+    memory         bigint unsigned not null,
+    disk_size      bigint unsigned not null,
+    disk_type      smallint unsigned not null,
+    disk_interface smallint unsigned not null,
+    pricing_id     integer unsigned not null,
+
+    constraint fk_custom_template_pricing foreign key (pricing_id) references vm_custom_pricing (id)
+);
+alter table vm
+    add constraint fk_vm_custom_template foreign key (custom_template_id) references vm_custom_template (id);