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Cal.com

Cal.com is an open source scheduling platform.

The Cal Wrapper is a WebAssembly(Wasm) foreign data wrapper which allows you to read data from your Cal.com account for use within your Postgres database.

Available Versions

Version Wasm Package URL Checksum
0.1.0 https://github.com/supabase/wrappers/releases/download/wasm_cal_fdw_v0.1.0/cal_fdw.wasm 4afe4fac8c51f2caa1de8483b3817d2cec3a14cd8a65a3942c8b4ff6c430f08a

Preparation

Before you can query Cal.com, you need to enable the Wrappers extension and store your credentials in Postgres.

Enable Wrappers

Make sure the wrappers extension is installed on your database:

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create extension if not exists wrappers with schema extensions;

Enable the Cal.com Wrapper

Enable the Wasm foreign data wrapper:

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create foreign data wrapper wasm_wrapper
  handler wasm_fdw_handler
  validator wasm_fdw_validator;

Store your credentials (optional)

By default, Postgres stores FDW credentials inside pg_catalog.pg_foreign_server in plain text. Anyone with access to this table will be able to view these credentials. Wrappers is designed to work with Vault, which provides an additional level of security for storing credentials. We recommend using Vault to store your credentials.

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-- Save your Cal.com API key in Vault and retrieve the `key_id`
insert into vault.secrets (name, secret)
values (
  'cal',
  '<Cal.com API key>' -- Cal.com API key
)
returning key_id;

Connecting to Cal.com

We need to provide Postgres with the credentials to access Cal.com and any additional options. We can do this using the create server command:

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create server cal_server
  foreign data wrapper wasm_wrapper
  options (
    fdw_package_url 'https://github.com/supabase/wrappers/releases/download/wasm_cal_fdw_v0.1.0/cal_fdw.wasm',
    fdw_package_name 'supabase:cal-fdw',
    fdw_package_version '0.1.0',
    fdw_package_checksum '4afe4fac8c51f2caa1de8483b3817d2cec3a14cd8a65a3942c8b4ff6c430f08a',
    api_url 'https://api.cal.com/v2',  -- optional
    api_key_id '<key_ID>' -- The Key ID from above.
  );

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create server cal_server
  foreign data wrapper wasm_wrapper
  options (
    fdw_package_url 'https://github.com/supabase/wrappers/releases/download/wasm_cal_fdw_v0.1.0/cal_fdw.wasm',
    fdw_package_name 'supabase:cal-fdw',
    fdw_package_version '0.1.0',
    fdw_package_checksum '4afe4fac8c51f2caa1de8483b3817d2cec3a14cd8a65a3942c8b4ff6c430f08a',
    api_url 'https://api.cal.com/v2',  -- optional
    api_key 'cal_live_1234...'  -- Cal.com API key
  );

Note the fdw_package_* options are required, which specify the Wasm package metadata. You can get the available package version list from above.

Create a schema

We recommend creating a schema to hold all the foreign tables:

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create schema if not exists cal;

Options

The full list of foreign table options are below:

  • object - Object name in Cal.com, required.

Supported objects are listed below:

Object name
my_profile
event-types
bookings
calendars
schedules
conferencing

Entities

The Cal.com Wrapper supports data reads and booking writes from the Cal.com API.

Profile

This is an object representing your Cal.com user profile.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Profile ✅ ❌ ❌ ❌ ❌

Usage

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create foreign table cal.my_profile (
  id bigint,
  username text,
  email text,
  attrs jsonb
)
  server cal_server
  options (
    object 'my_profile'
  );

Notes

  • The attrs column contains all profile attributes in JSON format

Event Types

This is an object representing Cal.com event types.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Event Types ✅ ❌ ❌ ❌ ❌

Usage

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create foreign table cal.event_types (
  attrs jsonb
)
  server cal_server
  options (
    object 'event-types'
  );

Notes

  • The attrs column contains all event type attributes in JSON format
  • Extract specific fields using JSON operators, for example: 
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    select
  etg->'profile'->>'name' as profile,
  et->>'id' as id,
  et->>'title' as title
from cal.event_types t
  cross join json_array_elements((attrs->'eventTypeGroups')::json) etg
  cross join json_array_elements((etg->'eventTypes')::json) et;

Bookings

This is an object representing Cal.com bookings.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Bookings ✅ ✅ ❌ ❌ ❌

Usage

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create foreign table cal.bookings (
  attrs jsonb
)
  server cal_server
  options (
    object 'bookings',
    rowid_column 'attrs'
  );

Notes

  • Supports both reading and creating bookings
  • The attrs column contains all booking attributes in JSON format
  • Example of creating a booking: 
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    insert into cal.bookings(attrs)
values (
  '{
    "start": "2024-12-12T10:30:00.000Z",
    "eventTypeId": 123456,
    "attendee": {
      "name": "Test Name",
      "email": "test.name@example.com",
      "timeZone": "America/New_York"
    }
  }'::jsonb
);
  • Additional fields like guests or metadata can be added to the booking JSON
  • For more details on booking options, refer to Cal.com documentation

Calendars

This is an object representing Cal.com calendars.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Calendars ✅ ❌ ❌ ❌ ❌

Usage

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create foreign table cal.calendars (
  attrs jsonb
)
  server cal_server
  options (
    object 'calendars'
  );

Notes

  • The attrs column contains all calendar attributes in JSON format

Schedules

This is an object representing Cal.com schedules.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Schedules ✅ ❌ ❌ ❌ ❌

Usage

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create foreign table cal.schedules (
  id bigint,
  name text,
  attrs jsonb
)
  server cal_server
  options (
    object 'schedules'
  );

Notes

  • The attrs column contains additional schedule attributes in JSON format

Conferencing

This is an object representing Cal.com conferencing settings.

Ref: Cal.com API docs

Operations

Object Select Insert Update Delete Truncate
Conferencing ✅ ❌ ❌ ❌ ❌

Usage

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create foreign table cal.conferencing (
  id bigint,
  attrs jsonb
)
  server cal_server
  options (
    object 'conferencing'
  );

Notes

  • The attrs column contains all conferencing attributes in JSON format

Query Pushdown Support

This FDW doesn't support query pushdown.

Supported Data Types

Postgres Data Type Cal.com Data Type
boolean Boolean
bigint Number
double precision Number
text String
jsonb Json

The Cal.com API uses JSON formatted data, please refer to Cal.com API docs for more details.

Limitations

This section describes important limitations and considerations when using this FDW:

  • Only supports Cal.com API v2
  • Large result sets may experience slower performance due to full data transfer requirement
  • Write operations limited to booking creation only
  • Materialized views using these foreign tables may fail during logical backups

Examples

Below are some examples on how to use Cal.com foreign tables.

Basic example

This example will create a "foreign table" inside your Postgres database and query its data. 

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create foreign table cal.my_profile (
  id bigint,
  username text,
  email text,
  attrs jsonb
)
  server cal_server
  options (
    object 'my_profile'
  );

-- query current user used for the Cal.com API request
select * from cal.my_profile;

attrs is a special column which stores all the object attributes in JSON format, you can extract any attributes needed from it. See more examples below.

Query JSON attributes

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create foreign table cal.bookings (
  attrs jsonb
)
  server cal_server
  options (
    object 'bookings',
    rowid_column 'attrs'
  );

create foreign table cal.event_types (
  attrs jsonb
)
  server cal_server
  options (
    object 'event-types'
  );

-- extract bookings
select
  bk->>'id' as id,
  bk->>'title' as title,
  bk->>'userPrimaryEmail' as email
from cal.bookings t
  cross join json_array_elements((attrs->'bookings')::json) bk;

-- extract event types
select
  etg->'profile'->>'name' as profile,
  et->>'id' as id,
  et->>'title' as title
from cal.event_types t
  cross join json_array_elements((attrs->'eventTypeGroups')::json) etg
  cross join json_array_elements((etg->'eventTypes')::json) et;

Make a booking

Once we know an event type ID (we can get it from above example, here we suppose it is 123456), we can make a booking using below SQL.

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insert into cal.bookings(attrs)
values (
  '{
     "start": "2024-12-12T10:30:00.000Z",
     "eventTypeId": 123456,
     "attendee": {
       "name": "Test Name",
       "email": "test.name@example.com",
       "timeZone": "America/New_York"
     }
  }'::jsonb
);

To add more details to the booking, such as guests or metadata, refer to Cal.com documentation.