feat: add workflow studio and postgres support

migrations/20260523000001_workflow_studio.sql

@@ -0,0 +1,64 @@
+-- BoosAPI Workflow Studio core tables.
+
+CREATE TABLE IF NOT EXISTS workflows (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    public_id TEXT NOT NULL UNIQUE,
+    user_id INTEGER,
+    name TEXT NOT NULL,
+    description TEXT,
+    graph TEXT NOT NULL DEFAULT '{}',
+    is_template INTEGER NOT NULL DEFAULT 0,
+    visibility TEXT NOT NULL DEFAULT 'private',
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now')),
+    deleted_at TEXT,
+    FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE SET NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_workflows_user_updated
+    ON workflows(user_id, updated_at DESC);
+CREATE INDEX IF NOT EXISTS idx_workflows_visibility
+    ON workflows(visibility);
+CREATE INDEX IF NOT EXISTS idx_workflows_deleted
+    ON workflows(deleted_at);
+
+CREATE TABLE IF NOT EXISTS workflow_runs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    public_id TEXT NOT NULL UNIQUE,
+    workflow_id INTEGER NOT NULL,
+    user_id INTEGER,
+    status TEXT NOT NULL,
+    input_overrides TEXT NOT NULL DEFAULT '{}',
+    final_outputs TEXT,
+    error_message TEXT,
+    started_at TEXT,
+    completed_at TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY(workflow_id) REFERENCES workflows(id) ON DELETE CASCADE,
+    FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE SET NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_workflow_runs_workflow_created
+    ON workflow_runs(workflow_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_workflow_runs_user_created
+    ON workflow_runs(user_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_workflow_runs_status
+    ON workflow_runs(status);
+
+CREATE TABLE IF NOT EXISTS workflow_node_runs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    run_id INTEGER NOT NULL,
+    node_id TEXT NOT NULL,
+    node_type TEXT NOT NULL,
+    status TEXT NOT NULL,
+    inputs TEXT NOT NULL DEFAULT '{}',
+    outputs TEXT,
+    error_message TEXT,
+    started_at TEXT,
+    completed_at TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY(run_id) REFERENCES workflow_runs(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_workflow_node_runs_run
+    ON workflow_node_runs(run_id, id);