feat: Add parameter and jobs database schema (#81)

* feat: Add parameter and jobs database schema

This modifies a prior migration which is typically forbidden,
but because we're pre-production deployment I felt grouping
would be helpful to future contributors.

This adds database functions that are required for the provisioner
daemon and job queue logic.

* Add comment to acquire provisioner job query

* PostgreSQL hates running in parallel

database/migrations/000002_projects.up.sql

@@ -48,6 +48,12 @@ CREATE TABLE project_history (
 -- Types of parameters the automator supports.
 CREATE TYPE parameter_type_system AS ENUM ('hcl');
 
+-- Supported schemes for a parameter source.
+CREATE TYPE parameter_source_scheme AS ENUM('data');
+
+-- Supported schemes for a parameter destination.
+CREATE TYPE parameter_destination_scheme AS ENUM('environment_variable', 'provisioner_variable');
+
 -- Stores project version parameters parsed on import.
 -- No secrets are stored here.
 -- 
@@ -65,11 +71,13 @@ CREATE TABLE project_parameter (
     -- 8KB limit
     description varchar(8192) NOT NULL DEFAULT '',
     -- eg. data://inlinevalue
-    default_source text,
+    default_source_scheme parameter_source_scheme,
+    default_source_value text,
     -- Allows the user to override the source.
     allow_override_source boolean NOT null,
     -- eg. env://SOME_VARIABLE, tfvars://example
-    default_destination text,
+    default_destination_scheme parameter_destination_scheme,
+    default_destination_value text,
     -- Allows the user to override the destination.
     allow_override_destination boolean NOT null,
     default_refresh text NOT NULL,

database/migrations/000004_jobs.up.sql

@@ -0,0 +1,53 @@
+CREATE TABLE IF NOT EXISTS provisioner_daemon (
+    id uuid NOT NULL UNIQUE,
+    created_at timestamptz NOT NULL,
+    updated_at timestamptz,
+    -- Name is generated for ease of differentiation.
+    -- eg. WowBananas16
+    name varchar(64) NOT NULL UNIQUE,
+    provisioners provisioner_type [ ] NOT NULL
+);
+
+CREATE TYPE provisioner_job_type AS ENUM (
+    'project_import',
+    'workspace_provision'
+);
+
+CREATE TABLE IF NOT EXISTS provisioner_job (
+    id uuid NOT NULL UNIQUE,
+    created_at timestamptz NOT NULL,
+    updated_at timestamptz NOT NULL,
+    started_at timestamptz,
+    cancelled_at timestamptz,
+    completed_at timestamptz,
+    error text,
+    initiator_id text NOT NULL,
+    provisioner provisioner_type NOT NULL,
+    type provisioner_job_type NOT NULL,
+    project_id uuid NOT NULL REFERENCES project(id) ON DELETE CASCADE,
+    input jsonb NOT NULL,
+    worker_id uuid
+);
+
+CREATE TYPE parameter_scope AS ENUM (
+     'organization',
+     'project',
+     'user',
+     'workspace'
+);
+
+-- Parameters are provided to jobs for provisioning and to workspaces.
+CREATE TABLE parameter_value (
+    id uuid NOT NULL UNIQUE,
+    name varchar(64) NOT NULL,
+    created_at timestamptz NOT NULL,
+    updated_at timestamptz NOT NULL,
+    scope parameter_scope NOT NULL,
+    scope_id text NOT NULL,
+    source_scheme parameter_source_scheme NOT NULL,
+    source_value text NOT NULL,
+    destination_scheme parameter_destination_scheme NOT NULL,
+    destination_value text NOT NULL,
+    -- Prevents duplicates for parameters in the same scope.
+    UNIQUE(name, scope, scope_id)
+);

database/migrations/create_migration.sh

@@ -8,4 +8,4 @@ fi
 
 migrate create -ext sql -dir . -seq $1
 
-echo "After making adjustments, run \"make database/generate\" to generate models."
+echo "Run \"make gen\" to generate models."