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# Blazer

Explore your data with SQL. Easily create charts and dashboards, and share them with your team.

[Try it out](https://blazer.dokkuapp.com)

[![Screenshot](https://blazer.dokkuapp.com/assets/blazer-176c595c.png)](https://blazer.dokkuapp.com)

Blazer is also available as a [Docker image](https://github.com/ankane/blazer-docker).

:tangerine: Battle-tested at [Instacart](https://www.instacart.com/opensource)

[![Build Status](https://github.com/ankane/blazer/actions/workflows/build.yml/badge.svg)](https://github.com/ankane/blazer/actions)

## Features

- **Multiple data sources** - PostgreSQL, MySQL, Redshift, and [many more](#full-list)
- **Variables** - run the same queries with different values
- **Checks & alerts** - get emailed when bad data appears
- **Audits** - all queries are tracked
- **Security** - works with your authentication system

## Docs

- [Installation](#installation)
- [Queries](#queries)
- [Charts](#charts)
- [Dashboards](#dashboards)
- [Checks](#checks)
- [Cohorts](#cohorts)
- [Anomaly Detection](#anomaly-detection)
- [Forecasting](#forecasting)
- [Uploads](#uploads)
- [Data Sources](#data-sources)
- [Query Permissions](#query-permissions)

## Installation

Add this line to your application’s Gemfile:

```ruby
gem "blazer"
```

Run:

```sh
rails generate blazer:install
rails db:migrate
```

And mount the dashboard in your `config/routes.rb`:

```ruby
mount Blazer::Engine, at: "blazer"
```

For production, specify your database:

```ruby
ENV["BLAZER_DATABASE_URL"] = "postgres://user:password@hostname:5432/database"
```

When possible, Blazer tries to protect against queries which modify data by running each query in a transaction and rolling it back, but a safer approach is to use a read-only user. [See how to create one](#permissions).

#### Checks (optional)

Be sure to set a host in `config/environments/production.rb` for emails to work.

```ruby
config.action_mailer.default_url_options = {host: "blazer.dokkuapp.com"}
```

Schedule checks to run (with cron, Solid Queue, [Heroku Scheduler](https://elements.heroku.com/addons/scheduler), etc). The default options are every 5 minutes, 1 hour, or 1 day, which you can customize. For each of these options, set up a task to run.

```sh
rake blazer:run_checks SCHEDULE="5 minutes"
rake blazer:run_checks SCHEDULE="1 hour"
rake blazer:run_checks SCHEDULE="1 day"
```

You can also set up failing checks to be sent once a day (or whatever you prefer).

```sh
rake blazer:send_failing_checks
```

Here’s what it looks like with cron.

```
*/5 * * * * rake blazer:run_checks SCHEDULE="5 minutes"
0   * * * * rake blazer:run_checks SCHEDULE="1 hour"
30  7 * * * rake blazer:run_checks SCHEDULE="1 day"
0   8 * * * rake blazer:send_failing_checks
```

For Solid Queue, update `config/recurring.yml`.

```yml
production:
  blazer_run_checks_5_minutes:
    command: "Blazer.run_checks(schedule: '5 minutes')"
    schedule: every 5 minutes
  blazer_run_checks_1_hour:
    command: "Blazer.run_checks(schedule: '1 hour')"
    schedule: every hour
  blazer_run_checks_1_day:
    command: "Blazer.run_checks(schedule: '1 day')"
    schedule: every day at 7:30am
  blazer_send_failing_checks:
    command: "Blazer.send_failing_checks"
    schedule: every day at 8am
```

For Slack notifications, create an [incoming webhook](https://slack.com/apps/A0F7XDUAZ-incoming-webhooks) and set:

```sh
BLAZER_SLACK_WEBHOOK_URL=https://hooks.slack.com/...
```

Name the webhook “Blazer” and add a cool icon.

## Authentication

Don’t forget to protect the dashboard in production.

### Basic Authentication

Set the following variables in your environment or an initializer.

```ruby
ENV["BLAZER_USERNAME"] = "andrew"
ENV["BLAZER_PASSWORD"] = "secret"
```

### Devise

```ruby
authenticate :user, ->(user) { user.admin? } do
  mount Blazer::Engine, at: "blazer"
end
```

### Other

Specify a `before_action` method to run in `config/blazer.yml`.

```yml
before_action_method: require_admin
```

You can define this method in your `ApplicationController`.

```ruby
def require_admin
  # depending on your auth, something like...
  redirect_to main_app.root_path unless current_user && current_user.admin?
end
```

Be sure to render or redirect for unauthorized users.

## Permissions

### PostgreSQL

Create a user with read-only permissions:

```sql
BEGIN;
CREATE ROLE blazer LOGIN PASSWORD 'secret';
GRANT CONNECT ON DATABASE dbname TO blazer;
GRANT USAGE ON SCHEMA public TO blazer;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO blazer;
ALTER DEFAULT PRIVILEGES FOR ROLE migrations_role IN SCHEMA public GRANT SELECT ON TABLES TO blazer;
COMMIT;
```

### MySQL and MariaDB

Create a user with read-only permissions:

```sql
CREATE USER 'blazer'@'127.0.0.1' IDENTIFIED BY 'secret';
GRANT SELECT, SHOW VIEW ON dbname.* TO 'blazer'@'127.0.0.1';
FLUSH PRIVILEGES;
```

## Sensitive Data

If your database contains sensitive or personal data, check out [Hypershield](https://github.com/ankane/hypershield) to shield it.

## Encrypted Data

If you need to search encrypted data, use [blind indexing](https://github.com/ankane/blind_index).

You can have Blazer transform specific variables with:

```ruby
Blazer.transform_variable = lambda do |name, value|
  value = User.generate_email_bidx(value) if name == "email_bidx"
  value
end
```

## Queries

### Variables

Create queries with variables.

```sql
SELECT * FROM users WHERE gender = {gender}
```

Use `{start_time}` and `{end_time}` for time ranges. [Example](https://blazer.dokkuapp.com/queries/9-time-range-selector?start_time=1997-10-03T05%3A00%3A00%2B00%3A00&end_time=1997-10-04T04%3A59%3A59%2B00%3A00)

```sql
SELECT * FROM ratings WHERE rated_at >= {start_time} AND rated_at <= {end_time}
```

### Smart Variables

[Example](https://blazer.dokkuapp.com/queries/1-smart-variable)

Suppose you have the query:

```sql
SELECT * FROM users WHERE occupation_id = {occupation_id}
```

Instead of remembering each occupation’s id, users can select occupations by name.

Add a smart variable in `config/blazer.yml` with:

```yml
smart_variables:
  occupation_id: "SELECT id, name FROM occupations ORDER BY name ASC"
```

The first column is the value of the variable, and the second column is the label.

You can also use an array or hash for static data and enums.

```yml
smart_variables:
  period: ["day", "week", "month"]
  status: {0: "Active", 1: "Archived"}
```

### Linked Columns

[Example](https://blazer.dokkuapp.com/queries/3-linked-column) - title column

Link results to other pages in your apps or around the web. Specify a column name and where it should link to. You can use the value of the result with `{value}`.

```yml
linked_columns:
  user_id: "/admin/users/{value}"
  ip_address: "https://www.infosniper.net/index.php?ip_address={value}"
```

### Smart Columns

[Example](https://blazer.dokkuapp.com/queries/2-smart-column) - occupation_id column

Suppose you have the query:

```sql
SELECT name, city_id FROM users
```

See which city the user belongs to without a join.

```yml
smart_columns:
  city_id: "SELECT id, name FROM cities WHERE id IN {value}"
```

You can also use a hash for static data and enums.

```yml
smart_columns:
  status: {0: "Active", 1: "Archived"}
```

### Caching

Blazer can automatically cache results to improve speed. It can cache slow queries:

```yml
cache:
  mode: slow
  expires_in: 60 # min
  slow_threshold: 15 # sec
```

Or it can cache all queries:

```yml
cache:
  mode: all
  expires_in: 60 # min
```

Of course, you can force a refresh at any time.

## Charts

Blazer will automatically generate charts based on the types of the columns returned in your query.

**Note:** The order of columns matters.

### Line Chart

There are two ways to generate line charts.

2+ columns - timestamp, numeric(s) - [Example](https://blazer.dokkuapp.com/queries/4-line-chart-format-1)

```sql
SELECT date_trunc('week', created_at), COUNT(*) FROM users GROUP BY 1
```

3 columns - timestamp, string, numeric - [Example](https://blazer.dokkuapp.com/queries/5-line-chart-format-2)

```sql
SELECT date_trunc('week', created_at), gender, COUNT(*) FROM users GROUP BY 1, 2
```

### Column Chart

There are also two ways to generate column charts.

2+ columns - string, numeric(s) - [Example](https://blazer.dokkuapp.com/queries/6-column-chart-format-1)

```sql
SELECT gender, COUNT(*) FROM users GROUP BY 1
```

3 columns - string, string, numeric - [Example](https://blazer.dokkuapp.com/queries/7-column-chart-format-2)

```sql
SELECT gender, zip_code, COUNT(*) FROM users GROUP BY 1, 2
```

### Scatter Chart

2 columns - both numeric - [Example](https://blazer.dokkuapp.com/queries/16-scatter-chart)

```sql
SELECT x, y FROM table
```

### Pie Chart

2 columns - string, numeric - and last column named `pie` - [Example](https://blazer.dokkuapp.com/queries/17-pie-chart)

```sql
SELECT gender, COUNT(*) AS pie FROM users GROUP BY 1
```

### Maps

Columns named `latitude` and `longitude` or `lat` and `lon` or `lat` and `lng` - [Example](https://blazer.dokkuapp.com/queries/15-map)

```sql
SELECT name, latitude, longitude FROM cities
```

or a column named `geojson`

```sql
SELECT name, geojson FROM counties
```

To enable, get an access token from [Mapbox](https://www.mapbox.com/) and set `ENV["MAPBOX_ACCESS_TOKEN"]`.

### Targets

Use the column name `target` to draw a line for goals. [Example](https://blazer.dokkuapp.com/queries/8-target-line)

```sql
SELECT date_trunc('week', created_at), COUNT(*) AS new_users, 100000 AS target FROM users GROUP BY 1
```

## Dashboards

Create a dashboard with multiple queries. [Example](https://blazer.dokkuapp.com/dashboards/1-dashboard-demo)

If the query has a chart, the chart is shown. Otherwise, you’ll see a table.

If any queries have variables, they will show up on the dashboard.

## Checks

Checks give you a centralized place to see the health of your data. [Example](https://blazer.dokkuapp.com/checks)

Create a query to identify bad rows.

```sql
SELECT * FROM ratings WHERE user_id IS NULL /* all ratings should have a user */
```

Then create check with optional emails if you want to be notified. Emails are sent when a check starts failing, and when it starts passing again.

## Cohorts

Create a cohort analysis from a simple SQL query. [Example](https://blazer.dokkuapp.com/queries/19-cohort-analysis-from-first-order)

Create a query with the comment `/* cohort analysis */`. The result should have columns named `user_id` and `conversion_time` and optionally `cohort_time`.

You can generate cohorts from the first conversion time:

```sql
/* cohort analysis */
SELECT user_id, created_at AS conversion_time FROM orders
```

(the first conversion isn’t counted in the first time period with this format)

Or from another time, like sign up:

```sql
/* cohort analysis */
SELECT users.id AS user_id, orders.created_at AS conversion_time, users.created_at AS cohort_time
FROM users LEFT JOIN orders ON orders.user_id = users.id
```

This feature requires PostgreSQL or MySQL 8.

## Anomaly Detection

Blazer supports three different approaches to anomaly detection.

### Prophet

Add [prophet-rb](https://github.com/ankane/prophet) to your Gemfile:

```ruby
gem "prophet-rb"
```

And add to `config/blazer.yml`:

```yml
anomaly_checks: prophet
```

### Trend

Add [trend](https://github.com/ankane/trend) to your Gemfile:

```ruby
gem "trend"
```

Set the URL to the [API](https://github.com/ankane/trend-api) in an initializer:

```ruby
Trend.url = "http://localhost:8000"
```

And add to `config/blazer.yml`:

```yml
anomaly_checks: trend
```

### AnomalyDetection.rb

Add [anomaly_detection](https://github.com/ankane/AnomalyDetection.rb) to your Gemfile:

```ruby
gem "anomaly_detection"
```

And add to `config/blazer.yml`:

```yml
anomaly_checks: anomaly_detection
```

## Forecasting

Blazer supports for two different forecasting methods.

A forecast link will appear for queries that return 2 columns with types timestamp and numeric.

### Prophet

Add [prophet-rb](https://github.com/ankane/prophet) to your Gemfile:

```ruby
gem "prophet-rb", ">= 0.2.1"
```

And add to `config/blazer.yml`:

```yml
forecasting: prophet
```

### Trend

Add [trend](https://github.com/ankane/trend) to your Gemfile:

```ruby
gem "trend"
```

Set the URL to the [API](https://github.com/ankane/trend-api) in an initializer:

```ruby
Trend.url = "http://localhost:8000"
```

And add to `config/blazer.yml`:

```yml
forecasting: trend
```

## Uploads

Create database tables from CSV files. [Example](https://blazer.dokkuapp.com/uploads)

Run:

```sh
rails generate blazer:uploads
rails db:migrate
```

And add to `config/blazer.yml`:

```yml
uploads:
  url: postgres://...
  schema: uploads
  data_source: main
```

This feature requires PostgreSQL. Create a new schema just for uploads.

```sql
CREATE SCHEMA uploads;
```

## Data Sources

Blazer supports multiple data sources :tada:

Add additional data sources in `config/blazer.yml`:

```yml
data_sources:
  main:
    url: <%= ENV["BLAZER_DATABASE_URL"] %>
    # timeout, smart_variables, linked_columns, smart_columns
  catalog:
    url: <%= ENV["CATALOG_DATABASE_URL"] %>
    # ...
  redshift:
    url: <%= ENV["REDSHIFT_DATABASE_URL"] %>
    # ...
```

### Full List

- [Amazon Athena](#amazon-athena)
- [Amazon Redshift](#amazon-redshift)
- [Apache Drill](#apache-drill)
- [Apache Hive](#apache-hive)
- [Apache Ignite](#apache-ignite)
- [Apache Spark](#apache-spark)
- [Cassandra](#cassandra)
- [ClickHouse](#clickhouse)
- [Druid](#druid)
- [Elasticsearch](#elasticsearch)
- [Google BigQuery](#google-bigquery)
- [IBM DB2 and Informix](#ibm-db2-and-informix)
- [InfluxDB](#influxdb)
- [MySQL and MariaDB](#mysql-and-mariadb-1)
- [Neo4j](#neo4j)
- [OpenSearch](#opensearch)
- [Oracle](#oracle)
- [PostgreSQL](#postgresql-1)
- [Presto and Trino](#presto-and-trino)
- [Salesforce](#salesforce)
- [Snowflake](#snowflake)
- [Socrata Open Data API (SODA)](#socrata-open-data-api-soda)
- [SQLite](#sqlite)
- [SQL Server](#sql-server)

You can also [create an adapter](#creating-an-adapter) for any other data store.

**Note:** In the examples below, we recommend using environment variables for urls.

```yml
data_sources:
  my_source:
    url: <%= ENV["BLAZER_MY_SOURCE_URL"] %>
```

### Amazon Athena

Add [aws-sdk-athena](https://github.com/aws/aws-sdk-ruby) and [aws-sdk-glue](https://github.com/aws/aws-sdk-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: athena
    database: database

# optional settings
    output_location: s3://some-bucket/
    workgroup: primary
    catalog: s3tablescatalog/some-bucket
    access_key_id: ...
    secret_access_key: ...
    region: ...
```

Here’s an example IAM policy:

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "athena:GetQueryExecution",
                "athena:GetQueryResults",
                "athena:StartQueryExecution"
            ],
            "Resource": [
                "arn:aws:athena:region:account-id:workgroup/primary"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "glue:GetTable",
                "glue:GetTables"
            ],
            "Resource": [
                "arn:aws:glue:region:account-id:catalog",
                "arn:aws:glue:region:account-id:database/default",
                "arn:aws:glue:region:account-id:table/default/*"
            ]
        }
    ]
}
```

You also need to configure [S3 permissions](https://repost.aws/knowledge-center/access-denied-athena).

### Amazon Redshift

Add [activerecord7-redshift-adapter-pennylane](https://github.com/pennylane-hq/activerecord-adapter-redshift) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: redshift://user:password@hostname:5439/database
```

Use a [read-only user](https://docs.aws.amazon.com/redshift/latest/dg/r_GRANT.html).

### Apache Drill

Add [drill-sergeant](https://github.com/ankane/drill-sergeant) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: drill
    url: http://hostname:8047
```

Use a [read-only user](https://drill.apache.org/docs/roles-and-privileges/).

### Apache Hive

Add [hexspace](https://github.com/ankane/hexspace) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: hive
    url: sasl://user:password@hostname:10000/database
```

Use a [read-only user](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Authorization). Requires [HiveServer2](https://cwiki.apache.org/confluence/display/Hive/Setting+Up+HiveServer2).

### Apache Ignite

Add [ignite-client](https://github.com/ankane/ignite-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: ignite://user:password@hostname:10800
```

Use a [read-only user](https://www.gridgain.com/docs/latest/administrators-guide/security/authorization-permissions) (requires a third-party plugin).

### Apache Spark

Add [hexspace](https://github.com/ankane/hexspace) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: spark
    url: sasl://user:password@hostname:10000/database
```

Use a read-only user. Requires the [Thrift server](https://spark.apache.org/docs/latest/sql-distributed-sql-engine.html).

### Cassandra

Add [cassandra-driver](https://github.com/datastax/ruby-driver) and [sorted_set](https://github.com/knu/sorted_set) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: cassandra://user:password@hostname:9042/keyspace
```

Use a [read-only role](https://docs.datastax.com/en/cql-oss/3.3/cql/cql_using/useSecurePermission.html).

### ClickHouse

Set:

```yml
data_sources:
  my_source:
    adapter: clickhouse
    url: https://user:password@hostname:8443
    database: default
```

### Druid

Enable [SQL support](https://druid.apache.org/docs/latest/querying/sql) on the broker and set:

```yml
data_sources:
  my_source:
    adapter: druid
    url: http://hostname:8082
```

Use a [read-only role](https://druid.apache.org/docs/latest/development/extensions-core/druid-basic-security.html).

### Elasticsearch

Add [elasticsearch](https://github.com/elastic/elasticsearch-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: elasticsearch
    url: http://user:password@hostname:9200
```

Use a [read-only role](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-privileges.html).

### Google BigQuery

Add [google-cloud-bigquery](https://github.com/GoogleCloudPlatform/google-cloud-ruby/tree/main/google-cloud-bigquery) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: bigquery
    project: your-project
    keyfile: path/to/keyfile.json
```

### IBM DB2 and Informix

Add [ibm_db](https://github.com/ibmdb/ruby-ibmdb) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: ibm-db://user:password@hostname:50000/database
```

Use a [read-only user](https://www.ibm.com/support/pages/creating-read-only-database-permissions-user).

### InfluxDB

Add [influxdb](https://github.com/influxdata/influxdb-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: influxdb
    url: http://user:password@hostname:8086/database
```

Use a [read-only user](https://docs.influxdata.com/influxdb/v1.8/administration/authentication_and_authorization/). Supports [InfluxQL](https://docs.influxdata.com/influxdb/v1.8/query_language/explore-data/).

### MySQL and MariaDB

Add [mysql2](https://github.com/brianmario/mysql2) to your Gemfile (if it’s not there) and set:

```yml
data_sources:
  my_source:
    url: mysql2://user:password@hostname:3306/database
```

Use a [read-only user](#mysql-and-mariadb).

### Neo4j

Add [neo4j-ruby-driver](https://github.com/neo4jrb/neo4j-ruby-driver) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: neo4j
    url: bolt://user:password@hostname:7687/database
```

Use a [read-only user](https://neo4j.com/docs/cypher-manual/current/access-control/manage-privileges/).

### OpenSearch

Add [opensearch-ruby](https://github.com/opensearch-project/opensearch-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: opensearch
    url: http://user:password@hostname:9200
```

Use a [read-only user](https://opensearch.org/docs/latest/security-plugin/access-control/permissions/).

### Oracle

Add [activerecord-oracle_enhanced-adapter](https://github.com/rsim/oracle-enhanced) and [ruby-oci8](https://github.com/kubo/ruby-oci8) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: oracle-enhanced://user:password@hostname:1521/database
```

Use a [read-only user](https://docs.oracle.com/cd/B19306_01/network.102/b14266/authoriz.htm).

### PostgreSQL

Add [pg](https://github.com/ged/ruby-pg) to your Gemfile (if it’s not there) and set:

```yml
data_sources:
  my_source:
    url: postgres://user:password@hostname:5432/database
```

Use a [read-only user](#postgresql).

### Presto and Trino

Add [presto-client](https://github.com/treasure-data/trino-client-ruby/tree/v0.6.5) or [trino-client](https://github.com/treasure-data/trino-client-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: presto://user@hostname:8080/catalog
    # or
    url: trino://user@hostname:8080/catalog
```

Use a read-only user for [Presto](https://prestodb.io/docs/current/security/built-in-system-access-control.html) or [Trino](https://trino.io/docs/current/security/built-in-system-access-control.html).

### Salesforce

Add [restforce](https://github.com/restforce/restforce) to your Gemfile and set:

```yml
data_sources:
  my_source:
    adapter: salesforce
```

And set the appropriate environment variables:

```sh
SALESFORCE_USERNAME="username"
SALESFORCE_PASSWORD="password"
SALESFORCE_SECURITY_TOKEN="security token"
SALESFORCE_CLIENT_ID="client id"
SALESFORCE_CLIENT_SECRET="client secret"
SALESFORCE_API_VERSION="41.0"
```

Use a read-only user. Supports [SOQL](https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql.htm).

### Snowflake

Set:

```yml
data_sources:
  my_source:
    adapter: snowflake2
    account_id: ...
    database: ...
    schema: PUBLIC
    access_token: ...
```

Use a [read-only role](https://docs.snowflake.com/en/user-guide/security-access-control-configure.html).

### Socrata Open Data API (SODA)

Set:

```yml
data_sources:
  my_source:
    adapter: soda
    url: https://soda.demo.socrata.com/resource/4tka-6guv.json
    app_token: ...
```

Supports [SoQL](https://dev.socrata.com/docs/functions/).

### SQLite

Add [sqlite3](https://github.com/sparklemotion/sqlite3-ruby) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: sqlite3:path/to/database.sqlite3
```

### SQL Server

Add [tiny_tds](https://github.com/rails-sqlserver/tiny_tds) and [activerecord-sqlserver-adapter](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter) to your Gemfile and set:

```yml
data_sources:
  my_source:
    url: sqlserver://user:password@hostname:1433/database
```

Use a [read-only user](https://docs.microsoft.com/en-us/sql/relational-databases/security/authentication-access/getting-started-with-database-engine-permissions?view=sql-server-ver15).

## Creating an Adapter

Create an adapter for any data store with:

```ruby
class FooAdapter < Blazer::Adapters::BaseAdapter
  # code goes here
end

Blazer.register_adapter "foo", FooAdapter
```

See the [Presto adapter](https://github.com/ankane/blazer/blob/master/lib/blazer/adapters/presto_adapter.rb) for a good example. Then use:

```yml
data_sources:
  my_source:
    adapter: foo
    url: http://user:password@hostname:9200/
```

## Query Permissions

Blazer supports a basic permissions model.

1. Queries without a name are unlisted
2. Queries whose name starts with `#` are only listed to the creator
3. Queries whose name starts with `*` can only be edited by the creator

## Learn SQL

Have team members who want to learn SQL? Here are a few great, free resources.

- [The Data School](https://dataschool.com/learn-sql/)
- [SQLBolt](https://sqlbolt.com/)

## Useful Tools

For an easy way to group by day, week, month, and more with correct time zones, check out [Groupdate.sql](https://github.com/ankane/groupdate.sql).

## Performance

By default, queries take up a request while they are running. To run queries asynchronously, add to your config:

```yml
async: true
```

**Note:** Requires caching to be enabled. If you have multiple web processes, your app must use a centralized cache store like Memcached or Redis.

```ruby
config.cache_store = :mem_cache_store
```

## Archiving

Archive queries that haven’t been viewed in over 90 days.

```sh
rake blazer:archive_queries
```

## Content Security Policy

If views are stuck with a `Loading...` message, there might be a problem with strict CSP settings in your app. This can be checked with Firefox or Chrome dev tools. You can allow Blazer to override these settings for its controllers with:

```yml
override_csp: true
```

## History

View the [changelog](https://github.com/ankane/blazer/blob/master/CHANGELOG.md)

## Thanks

Blazer uses a number of awesome open source projects, including [Rails](https://github.com/rails/rails), [Bootstrap](https://github.com/twbs/bootstrap), [Ace](https://github.com/ajaxorg/ace), [Chart.js](https://github.com/chartjs/Chart.js), [Moment.js](https://github.com/moment/moment), [Sortable](https://github.com/SortableJS/Sortable), [Tom Select](https://github.com/orchidjs/tom-select), and [Date Range Picker](https://github.com/dangrossman/daterangepicker).

Demo data from [MovieLens](https://grouplens.org/datasets/movielens/).

## Want to Make Blazer Better?

That’s awesome! Here are a few ways you can help:

- [Report bugs](https://github.com/ankane/blazer/issues)
- Fix bugs and [submit pull requests](https://github.com/ankane/blazer/pulls)
- Write, clarify, or fix documentation
- Suggest or add new features

Check out the [dev app](https://github.com/ankane/blazer-dev) to get started.

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