short-term and long-term capsuls

capsulflask/cli.py

@@ -12,8 +12,8 @@ from psycopg2 import ProgrammingError
 from flask_mail import Message
 
 from capsulflask.db import get_model
-from capsulflask.shared import my_exec_info_message
+from capsulflask.shared import my_exec_info_message, get_account_balance
-from capsulflask.console import get_account_balance
+from capsulflask.payment import check_if_shortterm_flag_can_be_unset
 from capsulflask.consistency import get_all_vms_from_db, get_all_vms_from_hosts, get_inconsistent_capsuls_information
 
 bp = Blueprint('cli', __name__)
@@ -85,11 +85,16 @@ def cron_task():
   clean_up_unresolved_btcpay_invoices()
   current_app.logger.info("cron_task: finished clean_up_unresolved_btcpay_invoices")
 
-  # notify when funds run out
+  # notify when funds are about to run out and delete long-term vms once account reaches -$10
   current_app.logger.info("cron_task: starting notify_users_about_account_balance")
   notify_users_about_account_balance()
   current_app.logger.info("cron_task: finished notify_users_about_account_balance")
 
+  # delete short-term vms and notify user once account reaches $0
+  current_app.logger.info("cron_task: starting delete_shortterm_vms_if_account_is_empty")
+  delete_shortterm_vms_if_account_is_empty()
+  current_app.logger.info("cron_task: finished delete_shortterm_vms_if_account_is_empty")
+
   # make sure vm system and DB are synced
   current_app.logger.info("cron_task: starting ensure_vms_and_db_are_synced")
   ensure_vms_and_db_are_synced()
@@ -118,7 +123,11 @@ def clean_up_unresolved_btcpay_invoices():
         f"resolving btcpay invoice {invoice_id} "
         f"({unresolved_invoice['email']}, ${unresolved_invoice['dollars']}) as completed "
       )
-      get_model().btcpay_invoice_resolved(invoice_id, True)
+      resolved_invoice_email = get_model().btcpay_invoice_resolved(invoice_id, True)
+
+      if resolved_invoice_email is not None:
+        check_if_shortterm_flag_can_be_unset(resolved_invoice_email)
+
     elif days >= 1:
       current_app.logger.info(
         f"resolving btcpay invoice {invoice_id} "
@@ -234,7 +243,12 @@ def notify_users_about_account_balance():
     balance_now = get_account_balance(vms, payments, datetime.utcnow())
     current_warning = account['account_balance_warning']
 
-    pluralize_capsul = "s" if len(vms) > 1 else ""
+    longterm_vms = list(filter(lambda vm: vm['shortterm'] == False, vms))
+
+    if len(longterm_vms) == 0:
+      continue
+
+    pluralize_capsul = "s" if len(longterm_vms) > 1 else ""
 
     warnings = get_warnings_list()
     current_warning_index = -1
@@ -262,12 +276,48 @@ def notify_users_about_account_balance():
       )
       get_model().set_account_balance_warning(account['email'], warnings[index_to_send]['id'])
       if index_to_send == len(warnings)-1:
-        for vm in vms:
+        for vm in longterm_vms:
           current_app.logger.warning(f"cron_task: deleting {vm['id']} ( {account['email']} ) due to negative account balance.")
           current_app.config["HUB_MODEL"].destroy(email=account["email"], id=vm['id'])
           get_model().delete_vm(email=account["email"], id=vm['id'])
 
 
+def delete_shortterm_vms_if_account_is_empty():
+  accounts = get_model().all_accounts()
+  for account in accounts:
+    vms = get_model().list_vms_for_account(account['email'])
+    payments = get_model().list_payments_for_account(account['email'])
+    balance = get_account_balance(vms, payments, datetime.utcnow())
+    shortterm_vms = list(filter(lambda vm: vm['shortterm'] == True, vms))
+
+    if len(shortterm_vms) > 0 and balance <= 0:
+     
+      pluralize_capsul = "s" if len(shortterm_vms) > 1 else ""
+      pluralize_past_tense = "have" if len(shortterm_vms) > 1 else "has"
+
+      current_app.config["FLASK_MAIL_INSTANCE"].send(
+          Message(
+            f"Short-term Capsul{pluralize_capsul} Deleted",
+            body=(
+              f"You have run out of funds! Your Short-term Capsul{pluralize_capsul} {pluralize_past_tense} been deleted.\n\n"
+            ),
+            sender=current_app.config["MAIL_DEFAULT_SENDER"],
+            recipients=[account['email']]
+          )
+      )
+
+      for vm in shortterm_vms:
+        current_app.logger.warning(f"cron_task: deleting shortterm vm {vm['id']} ( {account['email']} ) due to negative account balance.")
+        current_app.config["HUB_MODEL"].destroy(email=account["email"], id=vm['id'])
+        get_model().delete_vm(email=account["email"], id=vm['id'])
+    
+  
+
+
+      
+
+
+
 def ensure_vms_and_db_are_synced():
   db_vms_by_id = get_all_vms_from_db()
   virt_vms_by_id = get_all_vms_from_hosts(db_vms_by_id)

capsulflask/console.py

@@ -17,7 +17,7 @@ from nanoid import generate
 from capsulflask.metrics import durations as metric_durations
 from capsulflask.auth import account_required
 from capsulflask.db import get_model
-from capsulflask.shared import my_exec_info_message
+from capsulflask.shared import my_exec_info_message, get_vm_months_float, get_account_balance
 from capsulflask.payment import poll_btcpay_session
 from capsulflask import cli
 
@@ -201,13 +201,19 @@ def create():
   capacity_avaliable = current_app.config["HUB_MODEL"].capacity_avaliable(512*1024*1024)
   errors = list()
 
-  affordable_vm_sizes = dict()
+  month_funded_vm_sizes = dict()
+  hour_funded_vm_sizes = dict()
   for key, vm_size in vm_sizes.items():
     # if a user deposits $7.50 and then creates an f1-s vm which costs 7.50 a month, 
     # then they have to delete the vm and re-create it, they will not be able to, they will have to pay again.
     # so for UX it makes a lot of sense to give a small margin of 25 cents for usability sake
     if vm_size["dollars_per_month"] <= account_balance+0.25:
-      affordable_vm_sizes[key] = vm_size
+      month_funded_vm_sizes[key] = vm_size
+
+    one_month_in_hours = float(730.5)
+    two_hours_as_fraction_of_month = float(2)/one_month_in_hours
+    if float(vm_size["dollars_per_month"])*two_hours_as_fraction_of_month <= account_balance:
+      hour_funded_vm_sizes[key] = vm_size
 
   if request.method == "POST":
     if "csrf-token" not in request.form or request.form['csrf-token'] != session['csrf-token']:
@@ -219,8 +225,8 @@ def create():
       errors.append("Size is required")
     elif size not in vm_sizes:
       errors.append(f"Invalid size {size}")
-    elif size not in affordable_vm_sizes:
+    elif size not in hour_funded_vm_sizes:
-      errors.append(f"Your account must have enough credit to run an {size} for 1 month before you will be allowed to create it")
+      errors.append(f"Your account must have enough credit to run an {size} for 2 hours before you will be allowed to create it")
 
     if not os:
       errors.append("OS is required")
@@ -264,6 +270,7 @@ def create():
         id=id,
         os=os,
         size=size,
+        shortterm=(size not in month_funded_vm_sizes),
         template_image_file_name=operating_systems[os]['template_image_file_name'],
         vcpus=vm_sizes[size]['vcpus'],
         memory_mb=vm_sizes[size]['memory_mb'],
@@ -288,8 +295,9 @@ def create():
     ssh_authorized_key_count=len(public_keys_for_account),
     no_ssh_public_keys=len(public_keys_for_account) == 0,
     operating_systems=operating_systems,
-    cant_afford=len(affordable_vm_sizes) == 0,
+    cant_afford=len(hour_funded_vm_sizes) == 0,
-    vm_sizes=affordable_vm_sizes
+    vm_sizes=hour_funded_vm_sizes,
+    month_funded_vm_sizes=month_funded_vm_sizes
   )
 
 @bp.route("/ssh", methods=("GET", "POST"))
@@ -363,25 +371,6 @@ def get_payments():
   return g.user_payments
 
 
-average_number_of_days_in_a_month = 30.44
-
-def get_vm_months_float(vm, as_of):
-  end_datetime = vm["deleted"] if vm["deleted"] else as_of
-  days = float((end_datetime - vm["created"]).total_seconds())/float(60*60*24)
-  if days < 1:
-    days = float(1)
-  return days / average_number_of_days_in_a_month
-
-def get_account_balance(vms, payments, as_of):
-
-  vm_cost_dollars = 0.0
-  for vm in vms:
-    vm_months = get_vm_months_float(vm, as_of)
-    vm_cost_dollars += vm_months * float(vm["dollars_per_month"])
-
-  payment_dollars_total = float( sum(map(lambda x: 0 if x["invalidated"] else x["dollars"], payments)) )
-
-  return payment_dollars_total - vm_cost_dollars
 
 @bp.route("/account-balance")
 @account_required

capsulflask/db.py

@@ -50,7 +50,7 @@ def init_app(app, is_running_server):
   hasSchemaVersionTable = False
   actionWasTaken = False
   schemaVersion = 0
-  desiredSchemaVersion = 22
+  desiredSchemaVersion = 23
 
   cursor = connection.cursor()
 

capsulflask/db_model.py

@@ -140,13 +140,13 @@ class DBModel:
 
   def list_vms_for_account(self, email):
     self.cursor.execute(""" 
-      SELECT vms.id, vms.public_ipv4, vms.public_ipv6, vms.size, vms.os, vms.created, vms.deleted, vm_sizes.dollars_per_month
+      SELECT vms.id, vms.public_ipv4, vms.public_ipv6, vms.size, vms.shortterm, vms.os, vms.created, vms.deleted, vm_sizes.dollars_per_month
         FROM vms JOIN vm_sizes on vms.size = vm_sizes.id
       WHERE vms.email = %s""", 
       (email, )
     )
     return list(map(
-      lambda x: dict(id=x[0], ipv4=x[1], ipv6=x[2], size=x[3], os=x[4], created=x[5], deleted=x[6], dollars_per_month=x[7]), 
+      lambda x: dict(id=x[0], ipv4=x[1], ipv6=x[2], size=x[3], shortterm=x[4], os=x[5], created=x[6], deleted=x[7], dollars_per_month=x[8]), 
       self.cursor.fetchall()
     ))
 
@@ -164,12 +164,12 @@ class DBModel:
       )
     self.connection.commit()
 
-  def create_vm(self, email, id, size, os, host, network_name, public_ipv4, ssh_authorized_keys):
+  def create_vm(self, email, id, size, shortterm, os, host, network_name, public_ipv4, ssh_authorized_keys):
     self.cursor.execute(""" 
-      INSERT INTO vms (email, id, size, os, host, network_name, public_ipv4)
+      INSERT INTO vms (email, id, size, shortterm, os, host, network_name, public_ipv4)
-      VALUES  (%s, %s, %s, %s, %s, %s, %s)
+      VALUES  (%s, %s, %s, %s, %s, %s, %s, %s)
       """, 
-      (email, id, size, os, host, network_name, public_ipv4)
+      (email, id, size, shortterm, os, host, network_name, public_ipv4)
     )
     
     for ssh_authorized_key in ssh_authorized_keys:
@@ -188,7 +188,7 @@ class DBModel:
   def get_vm_detail(self, email, id):
     self.cursor.execute(""" 
       SELECT vms.id, vms.public_ipv4, vms.public_ipv6, os_images.description, vms.created, vms.deleted,
-            vm_sizes.id, vm_sizes.dollars_per_month, vm_sizes.vcpus, vm_sizes.memory_mb, vm_sizes.bandwidth_gb_per_month
+            vm_sizes.id, vms.shortterm, vm_sizes.dollars_per_month, vm_sizes.vcpus, vm_sizes.memory_mb, vm_sizes.bandwidth_gb_per_month
       FROM vms 
         JOIN os_images on vms.os = os_images.id
         JOIN vm_sizes on vms.size = vm_sizes.id
@@ -201,7 +201,8 @@ class DBModel:
 
     vm = dict(
       id=row[0], ipv4=row[1], ipv6=row[2], os_description=row[3], created=row[4], deleted=row[5],
-      size=row[6], dollars_per_month=row[7], vcpus=row[8], memory_mb=row[9], bandwidth_gb_per_month=row[10]
+      size=row[6], shortterm=row[7], dollars_per_month=row[8], vcpus=row[9], memory_mb=row[10],
+      bandwidth_gb_per_month=row[11],
     )
 
     self.cursor.execute(""" 
@@ -221,6 +222,10 @@ class DBModel:
 
     return vm
 
+  def clear_shortterm_flag(self, email):
+    self.cursor.execute("UPDATE vms SET shortterm = FALSE WHERE email = %s", (email))
+    self.connection.commit()
+
 
   #     ------    PAYMENTS & ACCOUNT BALANCE     ---------  
 
@@ -303,7 +308,7 @@ class DBModel:
     self.cursor.execute( "DELETE FROM payment_sessions WHERE id = %s AND type = %s", (id, payment_type) )
     self.connection.commit()
 
-  def btcpay_invoice_resolved(self, id, completed):
+  def btcpay_invoice_resolved(self, id, completed) -> str:
     self.cursor.execute("SELECT email, payment_id FROM unresolved_btcpay_invoices WHERE id = %s ", (id,))
     row = self.cursor.fetchone()
     if row:
@@ -313,6 +318,11 @@ class DBModel:
       
       self.connection.commit()
 
+      if completed:
+        return row[0]
+    
+    return None
+        
 
   def get_unresolved_btcpay_invoices(self):
     self.cursor.execute("""

capsulflask/hub_api.py

@@ -179,6 +179,7 @@ def on_create_claimed(payload, host_id):
     email=payload['email'], 
     id=payload['id'], 
     size=payload['size'], 
+    shortterm=payload['shortterm'], 
     os=payload['os'],
     host=host_id,
     network_name=payload['network_name'],

capsulflask/hub_model.py

@@ -38,16 +38,17 @@ class MockHub(VirtualizationInterface):
     return VirtualMachine(id, current_app.config["SPOKE_HOST_ID"], ipv4=self.default_ipv4)
 
   def get_all_by_id(self) -> dict:
-    by_host_and_network = get_model().non_deleted_vms_by_host_and_network()
+    by_host_and_network = get_model().non_deleted_vms_by_host_and_network(None)
     to_return = dict()
     for host in by_host_and_network.values():
       for network in host.values():
         for vm in network:
+          vm['state'] = vm['desired_state']
           to_return[vm['id']] = vm
 
     return to_return
 
-  def create(self, email: str, id: str, os: str, size: str, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_authorized_keys: list):
+  def create(self, email: str, id: str, os: str, size: str, shortterm: bool, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_authorized_keys: list):
     validate_capsul_id(id)
     current_app.logger.info(f"mock create: {id} for {email}")
     sleep(1)
@@ -55,6 +56,7 @@ class MockHub(VirtualizationInterface):
       email=email, 
       id=id, 
       size=size, 
+      shortterm=shortterm,
       os=os,
       host=current_app.config["SPOKE_HOST_ID"],
       network_name=self.default_network,
@@ -194,7 +196,7 @@ class CapsulFlaskHub(VirtualizationInterface):
 
     return to_return
 
-  def create(self, email: str, id: str, os: str, size: str, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_authorized_keys: list):
+  def create(self, email: str, id: str, os: str, size: str, shortterm: bool, template_image_file_name: str, vcpus: int, memory_mb: int, ssh_authorized_keys: list):
     validate_capsul_id(id)
     online_hosts = get_model().get_online_hosts()
     #current_app.logger.debug(f"hub_model.create(): ${len(online_hosts)} hosts")
@@ -204,6 +206,7 @@ class CapsulFlaskHub(VirtualizationInterface):
       id=id, 
       os=os,
       size=size,
+      shortterm=shortterm,
       template_image_file_name=template_image_file_name, 
       vcpus=vcpus,
       memory_mb=memory_mb,

capsulflask/payment.py

@@ -6,6 +6,7 @@ import re
 import sys
 
 from time import sleep
+from datetime import datetime, timedelta
 from flask import Blueprint
 from flask import make_response
 from flask import request
@@ -21,7 +22,7 @@ from werkzeug.exceptions import abort
 from capsulflask.auth import account_required
 
 from capsulflask.db import get_model
-from capsulflask.shared import my_exec_info_message
+from capsulflask.shared import my_exec_info_message, get_account_balance
 
 bp = Blueprint("payment", __name__, url_prefix="/payment")
 
@@ -118,7 +119,11 @@ def poll_btcpay_session(invoice_id):
       current_app.logger.info(f"{success_account} paid ${dollars} successfully (btcpay_invoice_id={invoice_id})")
 
   if invoice['status'] == "complete":
-    get_model().btcpay_invoice_resolved(invoice_id, True)
+    resolved_invoice_email = get_model().btcpay_invoice_resolved(invoice_id, True)
+    
+    if resolved_invoice_email is not None:
+      check_if_shortterm_flag_can_be_unset(resolved_invoice_email)
+
   elif invoice['status'] == "expired" or invoice['status'] == "invalid":
     get_model().btcpay_invoice_resolved(invoice_id, False)
     get_model().delete_payment_session("btcpay", invoice_id)
@@ -141,6 +146,16 @@ def btcpay_webhook():
   return result[1], result[0]
 
 
+# if the user has any shortterm vms (vms which were created at a time when they could not pay for that vm for 1 month)
+# then it would be nice if those vms could be "promoted" to long-term if they pay up enough to cover costs for 1 month
+def check_if_shortterm_flag_can_be_unset(email: str):
+  vms = get_model().list_vms_for_account(email)
+  payments = get_model().list_payments_for_account(email)
+  average_number_of_days_in_a_month = 30.44
+  balance = get_account_balance(vms, payments, datetime.utcnow() + timedelta(days=average_number_of_days_in_a_month))
+  if balance > 0:
+    get_model().clear_shortterm_flag(email)
+
 
 @bp.route("/stripe", methods=("GET", "POST"))
 @account_required
@@ -248,6 +263,9 @@ def validate_stripe_checkout_session(stripe_checkout_session_id):
       # its ok to call consume_payment_session more than once because it only takes an action if the session exists
       success_email = get_model().consume_payment_session("stripe", stripe_checkout_session_id, dollars)
 
+      if success_email is not None:
+        check_if_shortterm_flag_can_be_unset(success_email)
+
       if success_email:
         return dict(email=success_email, dollars=dollars)
 
@@ -264,6 +282,7 @@ def success():
       paid = validate_stripe_checkout_session(stripe_checkout_session_id)
       if paid:
         current_app.logger.info(f"{paid['email']} paid ${paid['dollars']} successfully (stripe_checkout_session_id={stripe_checkout_session_id})")
+        
         return redirect(url_for("console.account_balance"))
       else:
         sleep(1)

capsulflask/schema_migrations/23_down_ephemeral_vms.sql

@@ -0,0 +1,7 @@
+
+
+
+ALTER TABLE vms DROP shortterm desired_state;
+
+UPDATE schemaversion SET version = 22;
+

capsulflask/schema_migrations/23_up_ephemeral_vms.sql

@@ -0,0 +1,12 @@
+
+
+
+
+ALTER TABLE vms ADD COLUMN shortterm BOOLEAN NULL;
+
+UPDATE vms SET shortterm = TRUE WHERE shortterm is NULL;
+
+ALTER TABLE vms ALTER COLUMN shortterm SET NOT NULL;
+
+UPDATE schemaversion SET version = 23;
+

capsulflask/shared.py

@@ -1,6 +1,8 @@
 import re
 
 import traceback
+
+from datetime import datetime
 from flask import current_app
 from typing import List
 
@@ -58,6 +60,39 @@ def authorized_as_hub(headers):
     return auth_header_value == current_app.config["HUB_TOKEN"]
   return False
 
+def get_account_balance(vms, payments, as_of):
+
+  vm_cost_dollars = 0.0
+  for vm in vms:
+    vm_months = get_vm_months_float(vm, as_of)
+    vm_cost_dollars += vm_months * float(vm["dollars_per_month"])
+
+  payment_dollars_total = float( sum(map(lambda x: 0 if x["invalidated"] else x["dollars"], payments)) )
+
+  return payment_dollars_total - vm_cost_dollars
+
+
+average_number_of_days_in_a_month = 30.44
+
+def get_vm_months_float(vm, as_of):
+  end_datetime = vm["deleted"] if vm["deleted"] else as_of
+  days = float((end_datetime - vm["created"]).total_seconds())/float(60*60*24)
+  
+  # y / m / d
+  date_when_minimum_run_time_was_changed_to_one_hour = datetime(2022, 2, 7)
+
+  if vm["created"] >  date_when_minimum_run_time_was_changed_to_one_hour:
+    one_hour_in_days = float(1)/float(24)
+    if days < one_hour_in_days:
+      days = one_hour_in_days
+  else:
+    if days < 1:
+      days = float(1)
+  
+  return days / average_number_of_days_in_a_month
+
+
+
 def my_exec_info_message(exec_info):
   traceback_result = traceback.format_tb(exec_info[2])
   if isinstance(traceback_result, list):

capsulflask/spoke_model.py

@@ -40,11 +40,12 @@ class MockSpoke(VirtualizationInterface):
     return VirtualMachine(id, current_app.config["SPOKE_HOST_ID"], ipv4=ipv4, state="running")
 
   def get_all_by_id(self) -> dict:
-    by_host_and_network = get_model().non_deleted_vms_by_host_and_network()
+    by_host_and_network = get_model().non_deleted_vms_by_host_and_network(current_app.config["SPOKE_HOST_ID"])
     to_return = dict()
     for host in by_host_and_network.values():
       for network in host.values():
         for vm in network:
+          vm['state'] = vm['desired_state']
           to_return[vm['id']] = vm
 
     current_app.logger.info(f"MOCK get_all_by_id: {json.dumps(to_return)}")

capsulflask/templates/capsul-detail.html

@@ -61,6 +61,10 @@
         <label class="align" for="size">Capsul Size</label>
         <span id="size">{{ vm['size'] }}</span>
       </div>
+      <div class="row justify-start">
+        <label class="align" for="shortterm">Short-Term</label>
+        <span id="shortterm">{{ vm['shortterm'] }}</span>
+      </div>
       <div class="row justify-start">
         <label class="align" for="vm_state">State</label>
         {% if vm['state'] == 'starting' or vm['state'] == 'stopping'  %}
@@ -99,6 +103,12 @@
         <label class="align" for="ssh_username">SSH Username</label>
         <span id="ssh_username">cyberian</span>
       </div>
+
+      <div class="row justify-start">
+        <!-- spacer to make authorized keys show up on its own line -->
+        <label class="align" for="spacer">&nbsp;</label>
+        <span id="spacer">&nbsp;</span>
+      </div>
       <div class="row justify-start">
         <label class="align" for="ssh_authorized_keys">SSH Authorized Keys</label>
         <a id="ssh_authorized_keys" href="/console/ssh">{{ vm['ssh_authorized_keys'] }}</a>

capsulflask/templates/create-capsul.html

@@ -20,15 +20,14 @@
     f1-x     $27.50    3     4096M   25G   4TB
     f1-xx    $50.00    4     8192M   25G   5TB
 
-    * net is calculated as a per-month average
+    * all VMs come standard with one public IPv4 address
-    * vms are billed for a minimum of 24 hours upon creation
+    * vms are billed for a minimum of 1 hour upon creation</pre>
-    * all VMs come standard with one public IPv4 address</pre>
   <pre>
     Your <a href="/console/account-balance">account balance</a>: ${{ account_balance }}
   </pre>
   {% if cant_afford  %} 
   <p>Please <a href="/console/account-balance">fund your account</a> in order to create Capsuls</p>
-    <p>(At least one month of funding is required)</p>
+    <p>(At least two hours worth of funding is required)</p>
   {% elif no_ssh_public_keys %}
     <p>You don't have any ssh public keys yet.</p> 
     <p>You must <a href="/console/ssh">upload one</a> before you can create a Capsul.</p>
@@ -41,9 +40,29 @@
       <div class="row justify-start">
         <label class="align"  for="size">Capsul Size</label>
         <select id="size" name="size">
-          {% for size in vm_sizes.keys() %}<option value="{{ size }}">{{ size }}</option>{% endfor %}
+          {% for size in vm_sizes.keys() %}
+            {% if size in month_funded_vm_sizes  %}
+              <option value="{{ size }}">{{ size }}</option>
+            {% else %}
+              <option value="{{ size }}">{{ size }} (short-term)</option>
+            {% endif %}
+          {% endfor %}
         </select> 
       </div>
+      <div class="row justify-start">
+        <pre>
+  <b>NEW!</b> Short-term and Long-term Capsuls:
+
+  You may create a capsul even if your account balance won't 
+  fund it for long. It will be marked "short-term" and won't 
+  be backed up.
+
+  Short-term capsuls will be deleted as soon as your account 
+  balance reaches zero, while long-term capsuls get a 
+  non-payment grace period before they're are deleted.
+        </pre>
+      </div>
+
       <div class="row justify-start">
         <label class="align" for="os">Operating System</label>
         <select id="os" name="os">