Initial duckdb skill with HTTP API

SKILL.md

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+---
+name: duckdb
+description: DuckDB embedded analytical database with HTTP API
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: false
+---
+
+# DuckDB Skill
+
+[DuckDB](https://duckdb.org/) - fast in-process analytical database with a simple HTTP API.
+
+## Features
+
+- Embedded OLAP database (no separate server process)
+- Query CSV, Parquet, JSON files directly
+- SQL interface via HTTP API
+- Persistent storage option
+- Auto-registers with Caddy if present
+
+## Configuration
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `DUCKDB_PORT` | HTTP API port | `8432` |
+| `DUCKDB_DATABASE` | Database file path | `:memory:` |
+| `DUCKDB_DATA_DIR` | Directory for data files | `/data/duckdb` |
+| `DUCKDB_DOMAIN` | Domain for Caddy auto-config | (none) |
+| `DUCKDB_READ_ONLY` | Read-only mode | `false` |
+
+## HTTP API
+
+### Execute Query
+
+```bash
+# Simple query
+curl -X POST http://localhost:8432/query \
+  -H "Content-Type: application/json" \
+  -d '{"sql": "SELECT 1 + 1 AS result"}'
+
+# Query CSV file
+curl -X POST http://localhost:8432/query \
+  -d '{"sql": "SELECT * FROM read_csv_auto(\"/data/duckdb/sales.csv\") LIMIT 10"}'
+
+# Query Parquet file
+curl -X POST http://localhost:8432/query \
+  -d '{"sql": "SELECT * FROM read_parquet(\"/data/duckdb/events.parquet\")"}'
+```
+
+### Response Format
+
+```json
+{
+  "success": true,
+  "columns": ["result"],
+  "rows": [[2]],
+  "row_count": 1,
+  "time_ms": 0.5
+}
+```
+
+## Use Cases
+
+### Analytics on Log Data
+
+```sql
+-- Query JSON logs
+SELECT
+  json_extract_string(line, '$.level') as level,
+  count(*) as count
+FROM read_json_auto('/var/log/supervisor/*.log')
+GROUP BY level;
+```
+
+### Query Remote Data
+
+```sql
+-- Query remote Parquet (S3, HTTP)
+SELECT * FROM read_parquet('https://example.com/data.parquet');
+
+-- Query remote CSV
+SELECT * FROM read_csv_auto('https://example.com/data.csv');
+```
+
+### Create Persistent Tables
+
+```sql
+-- Create table
+CREATE TABLE events AS
+SELECT * FROM read_parquet('/data/duckdb/events.parquet');
+
+-- Query table
+SELECT date_trunc('hour', timestamp) as hour, count(*)
+FROM events
+GROUP BY 1 ORDER BY 1;
+```
+
+## CLI Access
+
+```bash
+# Interactive shell
+duckdb /data/duckdb/analytics.db
+
+# One-off query
+duckdb -c "SELECT * FROM 'data.csv' LIMIT 5"
+```
+
+## Extensions
+
+DuckDB supports extensions for additional functionality:
+
+```sql
+-- Install and load extensions
+INSTALL httpfs;
+LOAD httpfs;
+
+-- Now query S3/HTTP directly
+SELECT * FROM read_parquet('s3://bucket/data.parquet');
+```

scripts/autorun.sh

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+#!/bin/bash
+set -e
+
+DUCKDB_VERSION="${DUCKDB_VERSION:-1.1.3}"
+SKILLS_DIR="${SKILLS_DIR:-/skills}"
+DUCKDB_DATA_DIR="${DUCKDB_DATA_DIR:-/data/duckdb}"
+
+# Detect architecture
+get_arch() {
+    case "$(uname -m)" in
+        x86_64)  echo "amd64" ;;
+        aarch64) echo "aarch64" ;;
+        *)
+            echo "Unsupported architecture: $(uname -m)" >&2
+            exit 1
+            ;;
+    esac
+}
+
+# Install DuckDB CLI
+install_duckdb() {
+    if command -v duckdb &>/dev/null; then
+        echo "duckdb already installed: $(duckdb --version)"
+        return 0
+    fi
+
+    echo "Installing DuckDB v${DUCKDB_VERSION}..."
+    local arch=$(get_arch)
+    local url="https://github.com/duckdb/duckdb/releases/download/v${DUCKDB_VERSION}/duckdb_cli-linux-${arch}.zip"
+
+    apt-get update && apt-get install -y unzip
+
+    curl -sSL "$url" -o /tmp/duckdb.zip
+    unzip -o /tmp/duckdb.zip -d /tmp
+    mv /tmp/duckdb /usr/local/bin/duckdb
+    chmod +x /usr/local/bin/duckdb
+    rm /tmp/duckdb.zip
+
+    echo "DuckDB installed: $(duckdb --version)"
+}
+
+# Install socat for HTTP server
+install_socat() {
+    if command -v socat &>/dev/null; then
+        return 0
+    fi
+
+    echo "Installing socat..."
+    apt-get update && apt-get install -y socat jq
+}
+
+# Setup directories
+setup_dirs() {
+    mkdir -p "$DUCKDB_DATA_DIR"
+    echo "Data directory: $DUCKDB_DATA_DIR"
+}
+
+# Configure Caddy if present
+configure_caddy() {
+    local caddy_dir="$SKILLS_DIR/caddy"
+    local duckdb_port="${DUCKDB_PORT:-8432}"
+    local duckdb_domain="${DUCKDB_DOMAIN:-}"
+
+    if [ ! -d "$caddy_dir" ]; then
+        echo "Caddy not found - DuckDB API on port $duckdb_port"
+        return 0
+    fi
+
+    echo "Caddy detected - configuring reverse proxy..."
+    mkdir -p "$caddy_dir/snippets.d"
+
+    local snippet="$caddy_dir/snippets.d/duckdb.caddy"
+
+    if [ -n "$duckdb_domain" ]; then
+        cat > "$snippet" << EOF
+# Auto-generated by duckdb skill
+$duckdb_domain {
+    reverse_proxy localhost:$duckdb_port
+}
+EOF
+        echo "Caddy config: $duckdb_domain -> localhost:$duckdb_port"
+    else
+        cat > "$snippet" << EOF
+# Auto-generated by duckdb skill
+# Add to your site block:
+# handle /duckdb/* {
+#     uri strip_prefix /duckdb
+#     reverse_proxy localhost:$duckdb_port
+# }
+EOF
+        echo "Caddy snippet created (manual config needed)"
+    fi
+}
+
+install_duckdb
+install_socat
+setup_dirs
+configure_caddy
+
+echo "DuckDB setup complete"

scripts/run.sh

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+#!/bin/bash
+set -e
+
+DUCKDB_PORT="${DUCKDB_PORT:-8432}"
+DUCKDB_DATABASE="${DUCKDB_DATABASE:-:memory:}"
+DUCKDB_DATA_DIR="${DUCKDB_DATA_DIR:-/data/duckdb}"
+DUCKDB_READ_ONLY="${DUCKDB_READ_ONLY:-false}"
+
+# Create query handler script
+create_handler() {
+    cat > /tmp/duckdb_handler.sh << 'HANDLER'
+#!/bin/bash
+
+DUCKDB_DATABASE="${DUCKDB_DATABASE:-:memory:}"
+DUCKDB_READ_ONLY="${DUCKDB_READ_ONLY:-false}"
+
+# Read HTTP request
+read -r request_line
+method=$(echo "$request_line" | cut -d' ' -f1)
+path=$(echo "$request_line" | cut -d' ' -f2)
+
+# Read headers
+content_length=0
+while read -r header; do
+    header=$(echo "$header" | tr -d '\r')
+    [ -z "$header" ] && break
+    if [[ "$header" =~ ^[Cc]ontent-[Ll]ength:\ *([0-9]+) ]]; then
+        content_length="${BASH_REMATCH[1]}"
+    fi
+done
+
+# Read body
+body=""
+if [ "$content_length" -gt 0 ]; then
+    body=$(head -c "$content_length")
+fi
+
+# Route request
+send_response() {
+    local status="$1"
+    local content_type="$2"
+    local body="$3"
+    local body_length=${#body}
+
+    printf "HTTP/1.1 %s\r\n" "$status"
+    printf "Content-Type: %s\r\n" "$content_type"
+    printf "Content-Length: %d\r\n" "$body_length"
+    printf "Connection: close\r\n"
+    printf "\r\n"
+    printf "%s" "$body"
+}
+
+# Health check
+if [ "$path" = "/health" ]; then
+    send_response "200 OK" "application/json" '{"status":"ok"}'
+    exit 0
+fi
+
+# Query endpoint
+if [ "$path" = "/query" ] && [ "$method" = "POST" ]; then
+    # Extract SQL from JSON body
+    sql=$(echo "$body" | jq -r '.sql // empty')
+
+    if [ -z "$sql" ]; then
+        send_response "400 Bad Request" "application/json" '{"error":"Missing sql field"}'
+        exit 0
+    fi
+
+    # Build duckdb command
+    duckdb_args=()
+    if [ "$DUCKDB_READ_ONLY" = "true" ]; then
+        duckdb_args+=("-readonly")
+    fi
+    duckdb_args+=("-json")
+    duckdb_args+=("$DUCKDB_DATABASE")
+
+    # Execute query
+    start_time=$(date +%s%3N)
+    result=$(echo "$sql" | duckdb "${duckdb_args[@]}" 2>&1) || {
+        error_msg=$(echo "$result" | jq -Rs '.')
+        send_response "400 Bad Request" "application/json" "{\"success\":false,\"error\":$error_msg}"
+        exit 0
+    }
+    end_time=$(date +%s%3N)
+    time_ms=$((end_time - start_time))
+
+    # Parse result
+    if [ -z "$result" ] || [ "$result" = "[]" ]; then
+        send_response "200 OK" "application/json" "{\"success\":true,\"rows\":[],\"row_count\":0,\"time_ms\":$time_ms}"
+    else
+        row_count=$(echo "$result" | jq 'length')
+        columns=$(echo "$result" | jq -c '.[0] | keys')
+        rows=$(echo "$result" | jq -c '[.[] | [.[]]]')
+
+        response=$(jq -n \
+            --argjson columns "$columns" \
+            --argjson rows "$rows" \
+            --argjson row_count "$row_count" \
+            --argjson time_ms "$time_ms" \
+            '{success:true, columns:$columns, rows:$rows, row_count:$row_count, time_ms:$time_ms}')
+
+        send_response "200 OK" "application/json" "$response"
+    fi
+    exit 0
+fi
+
+# Not found
+send_response "404 Not Found" "application/json" '{"error":"Not found. Use POST /query"}'
+HANDLER
+
+    chmod +x /tmp/duckdb_handler.sh
+
+    # Export env vars for handler
+    export DUCKDB_DATABASE
+    export DUCKDB_READ_ONLY
+}
+
+# Serve HTTP API
+serve_api() {
+    echo "Starting DuckDB HTTP API on port $DUCKDB_PORT..."
+    echo "Database: $DUCKDB_DATABASE"
+    echo "Data directory: $DUCKDB_DATA_DIR"
+    [ "$DUCKDB_READ_ONLY" = "true" ] && echo "Mode: read-only"
+
+    exec socat TCP-LISTEN:$DUCKDB_PORT,reuseaddr,fork EXEC:"/tmp/duckdb_handler.sh"
+}
+
+create_handler
+serve_api