Add managed databases CLI for parquet table loads.

Introduce `hotdata databases` as the UX for managed connections: create catalogs, declare tables, load parquet uploads, and query via `name.schema.table`. Includes unit and integration tests plus README docs.

Author: eddietejeda

README.md

@@ -65,6 +65,7 @@ API key priority (lowest to highest): config file → `HOTDATA_API_KEY` env var
 | `auth` | `login`, `status`, `logout` | `login` or bare `auth` opens browser login; `status` / `logout` manage the saved profile |
 | `workspaces` | `list`, `set` | Manage workspaces |
 | `connections` | `list`, `create`, `refresh`, `new` | Manage connections |
+| `databases` | `list`, `create`, `delete`, `tables` | Managed databases (create and load tables via parquet) |
 | `tables` | `list` | List tables and columns |
 | `datasets` | `list`, `create`, `update` | Manage uploaded datasets |
 | `context` | `list`, `show`, `pull`, `push` | Workspace Markdown context (e.g. data model `DATAMODEL`) via the context API |
@@ -127,6 +128,34 @@ hotdata connections create list <type_name> --format json
 hotdata connections create --name "my-conn" --type postgres --config '{"host":"...","port":5432,...}'
 ```
 
+## Databases
+
+Managed databases are Hotdata-owned catalogs you create and populate yourself (no remote source to sync). Query them with SQL as `database_name.schema.table` — the database name is the connection name.
+
+```sh
+hotdata databases list [-w <id>] [-o table|json|yaml]
+hotdata databases create --name <name> [--table <table> ...] [--schema public] [-o table|json|yaml]
+hotdata databases <name_or_id> [-o table|json|yaml]
+hotdata databases delete <name_or_id>
+
+hotdata databases tables list <database> [--schema <name>] [-o table|json|yaml]
+hotdata databases tables load <database> <table> --file ./data.parquet [--schema public]
+hotdata databases tables load <database> <table> --upload-id <id> [--schema public]
+hotdata databases tables delete <database> <table> [--schema public]
+```
+
+- `create` registers a managed connection (`source_type: managed`) with no external credentials. Use `--table` to declare tables up front (required before `tables load` on the current API).
+- `tables load` uploads a **parquet** file (or uses a staged `upload_id` from `POST /v1/files`) and publishes it as the table generation (`replace` mode).
+- For CSV/JSON uploads without a managed database, use `hotdata datasets create` instead (`datasets.main.*`).
+
+Example:
+
+```sh
+hotdata databases create --name sales --table orders
+hotdata databases tables load sales orders --file ./orders.parquet
+hotdata query "SELECT count(*) FROM sales.public.orders"
+```
+
 ## Tables
 
 ```sh

src/command.rs

@@ -69,6 +69,23 @@ pub enum Commands {
         command: Option<ConnectionsCommands>,
     },
 
+    /// Managed databases you create and populate with tables (parquet uploads)
+    Databases {
+        /// Database name or connection ID (omit to use a subcommand)
+        name_or_id: Option<String>,
+
+        /// Workspace ID (defaults to first workspace from login)
+        #[arg(long, short = 'w', global = true)]
+        workspace_id: Option<String>,
+
+        /// Output format
+        #[arg(long = "output", short = 'o', default_value = "table", value_parser = ["table", "json", "yaml"])]
+        output: String,
+
+        #[command(subcommand)]
+        command: Option<DatabasesCommands>,
+    },
+
     /// Manage tables in a workspace
     Tables {
         #[command(subcommand)]
@@ -515,6 +532,98 @@ pub enum ConnectionsCreateCommands {
     },
 }
 
+#[derive(Subcommand)]
+pub enum DatabasesCommands {
+    /// List managed databases in the workspace
+    List {
+        /// Output format
+        #[arg(long = "output", short = 'o', default_value = "table", value_parser = ["table", "json", "yaml"])]
+        output: String,
+    },
+
+    /// Create a new managed database
+    Create {
+        /// Database name (used as the connection name in SQL: `name.schema.table`)
+        #[arg(long)]
+        name: String,
+
+        /// Schema for tables declared at create time (default: public)
+        #[arg(long, default_value = "public")]
+        schema: String,
+
+        /// Table to declare up front (repeatable). Required before load on current API.
+        #[arg(long = "table")]
+        tables: Vec<String>,
+
+        /// Output format
+        #[arg(long = "output", short = 'o', default_value = "table", value_parser = ["table", "json", "yaml"])]
+        output: String,
+    },
+
+    /// Delete a managed database and its tables
+    Delete {
+        /// Database name or connection ID
+        name_or_id: String,
+    },
+
+    /// Manage tables inside a managed database
+    Tables {
+        #[command(subcommand)]
+        command: DatabaseTablesCommands,
+    },
+}
+
+#[derive(Subcommand)]
+pub enum DatabaseTablesCommands {
+    /// List tables in a managed database
+    List {
+        /// Database name or connection ID
+        database: String,
+
+        /// Filter by schema name
+        #[arg(long)]
+        schema: Option<String>,
+
+        /// Output format
+        #[arg(long = "output", short = 'o', default_value = "table", value_parser = ["table", "json", "yaml"])]
+        output: String,
+    },
+
+    /// Load a parquet file into a table (creates or replaces the table)
+    Load {
+        /// Database name or connection ID
+        database: String,
+
+        /// Table name
+        table: String,
+
+        /// Schema name (default: public)
+        #[arg(long, default_value = "public")]
+        schema: String,
+
+        /// Path to a local parquet file to upload and load
+        #[arg(long, conflicts_with = "upload_id")]
+        file: Option<String>,
+
+        /// Use a previously staged upload ID from `POST /v1/files` instead of uploading
+        #[arg(long)]
+        upload_id: Option<String>,
+    },
+
+    /// Delete a table from a managed database
+    Delete {
+        /// Database name or connection ID
+        database: String,
+
+        /// Table name
+        table: String,
+
+        /// Schema name (default: public)
+        #[arg(long, default_value = "public")]
+        schema: String,
+    },
+}
+
 #[derive(Subcommand)]
 pub enum ConnectionsCommands {
     /// Interactively create a new connection