diff --git a/data/bin/duckdb b/data/bin/duckdb
new file mode 100644
index 0000000..c2b4b5b
--- /dev/null
+++ b/data/bin/duckdb
@@ -0,0 +1 @@
+DuckDB In-Memory SQL Database
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 390e337..6e6719c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,19 +8,22 @@
       "name": "akash-portfolio",
       "version": "0.1.0",
       "dependencies": {
+        "@duckdb/duckdb-wasm": "^1.29.0",
+        "@tailwindcss/postcss": "^4.0.14",
         "@vercel/analytics": "^1.5.0",
         "@vercel/speed-insights": "^1.2.0",
         "js-argparse": "^0.3.4",
         "next": "15.5.2",
+        "postcss": "^8.5.3",
         "react": "19.0.0",
         "react-dom": "19.0.0",
         "react-innertext": "^1.1.5",
         "table": "^6.9.0",
+        "tailwindcss": "^4.0.14",
         "zustand": "^5.0.3"
       },
       "devDependencies": {
         "@eslint/js": "^9.22.0",
-        "@tailwindcss/postcss": "^4.0.14",
         "@types/emscripten": "^1.40.0",
         "@types/figlet": "^1.7.0",
         "@types/node": "22.13.10",
@@ -28,8 +31,6 @@
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         "eslint": "9.22.0",
         "eslint-config-next": "15.2.2",
-        "postcss": "^8.5.3",
-        "tailwindcss": "^4.0.14",
         "typescript": "5.8.2",
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@@ -38,7 +39,6 @@
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-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=10"
@@ -47,16 +47,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/@emnapi/core": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.3.1.tgz",
-      "integrity": "sha512-pVGjBIt1Y6gg3EJN8jTcfpP/+uuRksIo055oE/OBkDNcjZqVbfkWCksG1Jp4yZnj3iKWyWX8fdG/j6UDYPbFog==",
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
+    "node_modules/@duckdb/duckdb-wasm": {
+      "version": "1.30.0",
+      "resolved": "https://registry.npmjs.org/@duckdb/duckdb-wasm/-/duckdb-wasm-1.30.0.tgz",
+      "integrity": "sha512-9aWrm+4ayl4sTlvGtl/b+LxrUyXaac3yyVqkoJ3F7Vkd62PoS8PcQIRJ/KjXBW36LP1CnPY5jjvFyIcTFLtcXA==",
       "dependencies": {
-        "@emnapi/wasi-threads": "1.0.1",
-        "tslib": "^2.4.0"
+        "apache-arrow": "^17.0.0"
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     "node_modules/@emnapi/runtime": {
@@ -69,17 +65,6 @@
         "tslib": "^2.4.0"
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-    "node_modules/@emnapi/wasi-threads": {
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-      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.0.1.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "dependencies": {
-        "tslib": "^2.4.0"
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     "node_modules/@eslint-community/eslint-utils": {
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       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
@@ -275,7 +260,6 @@
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         "arm64"
       ],
-      "license": "Apache-2.0",
       "optional": true,
       "os": [
         "darwin"
@@ -297,7 +281,6 @@
       "cpu": [
         "x64"
       ],
-      "license": "Apache-2.0",
       "optional": true,
       "os": [
         "darwin"
@@ -319,7 +302,6 @@
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         "arm64"
       ],
-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "darwin"
@@ -335,7 +317,6 @@
       "cpu": [
         "x64"
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-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "darwin"
@@ -351,7 +332,6 @@
       "cpu": [
         "arm"
       ],
-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "linux"
@@ -367,7 +347,6 @@
       "cpu": [
         "arm64"
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-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "linux"
@@ -399,7 +378,6 @@
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         "s390x"
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-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "linux"
@@ -415,7 +393,6 @@
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-      "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "linux"
@@ -431,7 +408,6 @@
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       ],
-      "license": "LGPL-3.0-or-later",
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       "os": [
         "linux"
@@ -447,7 +423,6 @@
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-      "license": "LGPL-3.0-or-later",
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@@ -463,7 +438,6 @@
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-      "license": "Apache-2.0",
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@@ -485,7 +459,6 @@
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-      "license": "Apache-2.0",
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@@ -529,7 +502,6 @@
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-      "license": "Apache-2.0",
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@@ -551,7 +523,6 @@
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-      "license": "Apache-2.0",
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@@ -573,7 +544,6 @@
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-      "license": "Apache-2.0",
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@@ -595,7 +565,6 @@
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-      "license": "Apache-2.0",
       "optional": true,
       "os": [
         "linux"
@@ -617,7 +586,6 @@
       "cpu": [
         "wasm32"
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-      "license": "Apache-2.0 AND LGPL-3.0-or-later AND MIT",
       "optional": true,
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@@ -655,7 +623,6 @@
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-      "license": "Apache-2.0 AND LGPL-3.0-or-later",
       "optional": true,
       "os": [
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@@ -674,7 +641,6 @@
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-      "license": "Apache-2.0 AND LGPL-3.0-or-later",
       "optional": true,
       "os": [
         "win32"
@@ -686,24 +652,10 @@
         "url": "https://opencollective.com/libvips"
       }
     },
-    "node_modules/@napi-rs/wasm-runtime": {
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-      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.7.tgz",
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-      "license": "MIT",
-      "optional": true,
-      "dependencies": {
-        "@emnapi/core": "^1.3.1",
-        "@emnapi/runtime": "^1.3.1",
-        "@tybys/wasm-util": "^0.9.0"
-      }
-    },
     "node_modules/@next/env": {
       "version": "15.5.2",
       "resolved": "https://registry.npmjs.org/@next/env/-/env-15.5.2.tgz",
-      "integrity": "sha512-Qe06ew4zt12LeO6N7j8/nULSOe3fMXE4dM6xgpBQNvdzyK1sv5y4oAP3bq4LamrvGCZtmRYnW8URFCeX5nFgGg==",
-      "license": "MIT"
+      "integrity": "sha512-Qe06ew4zt12LeO6N7j8/nULSOe3fMXE4dM6xgpBQNvdzyK1sv5y4oAP3bq4LamrvGCZtmRYnW8URFCeX5nFgGg=="
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@@ -722,7 +674,6 @@
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-      "license": "MIT",
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@@ -738,7 +689,6 @@
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-      "license": "MIT",
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@@ -754,7 +704,6 @@
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-      "license": "MIT",
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@@ -770,7 +719,6 @@
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-      "license": "MIT",
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@@ -786,7 +734,6 @@
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-      "license": "MIT",
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@@ -802,7 +749,6 @@
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-      "license": "MIT",
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@@ -818,7 +764,6 @@
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-      "license": "MIT",
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@@ -834,7 +779,6 @@
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-      "license": "MIT",
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@@ -918,7 +862,6 @@
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-      "dev": true,
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@@ -930,7 +873,6 @@
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-      "dev": true,
       "license": "MIT",
       "bin": {
         "jiti": "lib/jiti-cli.mjs"
@@ -940,7 +882,6 @@
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       "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.0.14.tgz",
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-      "dev": true,
       "license": "MIT",
       "engines": {
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@@ -959,23 +900,6 @@
         "@tailwindcss/oxide-win32-x64-msvc": "4.0.14"
       }
     },
-    "node_modules/@tailwindcss/oxide-android-arm64": {
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-      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-android-arm64/-/oxide-android-arm64-4.0.14.tgz",
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@@ -983,7 +907,6 @@
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@@ -993,164 +916,10 @@
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@@ -1483,163 +1251,20 @@
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@@ -4349,6 +3897,11 @@
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@@ -5593,6 +5141,26 @@
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@@ -5870,6 +5436,14 @@
         "typescript": ">=4.8.4 <5.9.0"
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+      "resolved": "https://registry.npmjs.org/typical/-/typical-4.0.0.tgz",
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@@ -6021,6 +5595,14 @@
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diff --git a/package.json b/package.json
index 3d48a17..81a9048 100644
--- a/package.json
+++ b/package.json
@@ -11,19 +11,22 @@
     "clean": "make clean"
   },
   "dependencies": {
+    "@duckdb/duckdb-wasm": "^1.29.0",
+    "@tailwindcss/postcss": "^4.0.14",
     "@vercel/analytics": "^1.5.0",
     "@vercel/speed-insights": "^1.2.0",
     "js-argparse": "^0.3.4",
     "next": "15.5.2",
+    "postcss": "^8.5.3",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "react-innertext": "^1.1.5",
     "table": "^6.9.0",
+    "tailwindcss": "^4.0.14",
     "zustand": "^5.0.3"
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@@ -31,8 +34,6 @@
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diff --git a/public/wasm/fs/fs.data b/public/wasm/fs/fs.data
index 0c0e8d8..30832f5 100644
--- a/public/wasm/fs/fs.data
+++ b/public/wasm/fs/fs.data
@@ -1,4 +1,4 @@
-Command to read fileA talking catCommand to change directory Command to clear terminal screenCommand to get helpCommand to list directoryCommand to make directory+---------------------------+--------------------------------+----------------------------------------------------------------------+
+Command to read fileA talking catCommand to change directory Command to clear terminal screenDuckDB In-Memory SQL DatabaseCommand to get helpCommand to list directoryCommand to make directory+---------------------------+--------------------------------+----------------------------------------------------------------------+
 | Project                   | Technologies                   | Link                                                                 |
 |---------------------------|--------------------------------|----------------------------------------------------------------------|
 | Bash Portfolio            | WebAssembly, Next.js           | https://github.com/skywalker212/bash-portfolio                       |
diff --git a/public/wasm/fs/fs.js b/public/wasm/fs/fs.js
index aa510c6..423c52d 100644
--- a/public/wasm/fs/fs.js
+++ b/public/wasm/fs/fs.js
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+var ja=l.wasmBinary,ka,la=!1,ma,u,w,x,na,z,A,oa,B,pa,ra,sa=!1;function ta(){var a=ka.buffer;l.HEAP8=u=new Int8Array(a);l.HEAP16=x=new Int16Array(a);l.HEAPU8=w=new Uint8Array(a);l.HEAPU16=na=new Uint16Array(a);l.HEAP32=z=new Int32Array(a);l.HEAPU32=A=new Uint32Array(a);l.HEAPF32=oa=new Float32Array(a);l.HEAPF64=ra=new Float64Array(a);l.HEAP64=B=new BigInt64Array(a);l.HEAPU64=pa=new BigUint64Array(a)}var ua=0,va=null;function wa(){ua++;l.monitorRunDependencies?.(ua)}
+function xa(){ua--;l.monitorRunDependencies?.(ua);if(0==ua&&va){var a=va;va=null;a()}}function ya(a){l.onAbort?.(a);a="Aborted("+a+")";ia(a);la=!0;a+=". Build with -sASSERTIONS for more info.";sa&&za();a=new WebAssembly.RuntimeError(a);ba(a);throw a;}var Aa;async function Ba(a){if(!ja)try{var b=await fa(a);return new Uint8Array(b)}catch{}if(a==Aa&&ja)a=new Uint8Array(ja);else throw"both async and sync fetching of the wasm failed";return a}
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diff --git a/src/commands/duckdb.ts b/src/commands/duckdb.ts
new file mode 100644
index 0000000..dc69a07
--- /dev/null
+++ b/src/commands/duckdb.ts
@@ -0,0 +1,181 @@
+import { Command, CommandResultType } from '@/types';
+import { ArgumentParser } from 'js-argparse';
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { createInMemoryDuckDBConnection, createPersistentDuckDBConnection, closeConnection } from '@/lib/duckdb/connection';
+import { executeSqlStatement } from '@/lib/duckdb/queryExecutor';
+import { DuckDBReplState, DEFAULT_DB_NAME, MULTILINE_PROMPT } from '@/lib/duckdb/types';
+import { isMetaCommand, executeMetaCommand } from '@/lib/duckdb/metaCommands';
+import { isCompleteSqlStatement, appendToMultilineBuffer } from '@/lib/duckdb/sqlParser';
+
+const name = "duckdb";
+const description = "In-memory SQL database using DuckDB";
+
+type Args = {
+    sql: string[];
+    persistent?: boolean;
+    database?: string;
+}
+
+type DuckDBCommand = Command<Args>;
+
+const duckdbArgs = new ArgumentParser<Args>(name, description);
+
+duckdbArgs.addArgument(['sql'], {
+    required: false,
+    metavar: "SQL",
+    help: "SQL query to execute",
+    nargs: "*",
+    default: []
+});
+
+duckdbArgs.addArgument(['-p', '--persistent'], {
+    type: "boolean",
+    default: false,
+    help: "Use persistent database (stored in IndexedDB)"
+});
+
+duckdbArgs.addArgument(['-d', '--database'], {
+    help: "Database name (for persistent mode)",
+    default: DEFAULT_DB_NAME
+});
+
+function createInitialReplState(
+    db: duckdb.AsyncDuckDB,
+    connection: duckdb.AsyncDuckDBConnection,
+    isPersistent: boolean,
+    dbName: string
+): DuckDBReplState {
+    return {
+        connection,
+        db,
+        sessionId: crypto.randomUUID(),
+        dbName,
+        isPersistent,
+        queryHistory: [],
+        outputFormat: 'table',
+        multilineBuffer: '',
+        loadedFiles: []
+    };
+}
+
+const helpMessage = `DuckDB In-Memory SQL Database
+
+Usage:
+  duckdb                          Enter interactive REPL mode
+  duckdb "SQL query"              Execute a single SQL query
+
+REPL Commands:
+  .exit                           Exit REPL mode
+  .help                           Show this help message
+
+Examples:
+  duckdb
+  > CREATE TABLE users (id INT, name VARCHAR, age INT)
+  > INSERT INTO users VALUES (1, 'Alice', 30), (2, 'Bob', 25)
+  > SELECT * FROM users
+  > .exit
+
+Or single command:
+  duckdb "SELECT 1 + 1 as result"
+
+Note: In REPL mode, database persists across queries. Exiting REPL clears the database.`;
+
+export const duckdbCommand: DuckDBCommand = {
+    name,
+    args: duckdbArgs,
+    description,
+    execute: async ({ terminalStore, fileSystem }, args) => {
+        try {
+            const sqlInput = args.sql.join(" ").trim();
+            const isInRepl = terminalStore.replMode === 'duckdb';
+
+            if (isInRepl) {
+                const state = terminalStore.replData as DuckDBReplState;
+
+                if (isMetaCommand(sqlInput)) {
+                    const result = await executeMetaCommand(sqlInput, state, { terminalStore, fileSystem });
+
+                    if (result.metadata?.shouldExit) {
+                        await closeConnection(state.connection);
+                        terminalStore.setReplMode(null);
+                        return {
+                            content: "Exited DuckDB REPL",
+                            type: CommandResultType.INFO
+                        };
+                    }
+
+                    return result;
+                }
+
+                if (!sqlInput) {
+                    return {
+                        content: helpMessage,
+                        type: CommandResultType.TEXT
+                    };
+                }
+
+                state.multilineBuffer = appendToMultilineBuffer(state.multilineBuffer, sqlInput);
+
+                if (!isCompleteSqlStatement(state.multilineBuffer)) {
+                    return {
+                        content: MULTILINE_PROMPT,
+                        type: CommandResultType.INFO
+                    };
+                }
+
+                const completeStatement = state.multilineBuffer;
+                state.multilineBuffer = '';
+
+                const result = await executeSqlStatement(state.connection, completeStatement, state.outputFormat);
+
+                if (result.type !== CommandResultType.ERROR) {
+                    state.queryHistory.push(completeStatement);
+                }
+
+                return result;
+            }
+
+            if (!sqlInput) {
+                let db: duckdb.AsyncDuckDB;
+                let connection: duckdb.AsyncDuckDBConnection;
+                let wasRestored = false;
+
+                if (args.persistent) {
+                    const result = await createPersistentDuckDBConnection(args.database!);
+                    db = result.db;
+                    connection = result.connection;
+                    wasRestored = result.wasRestored;
+                } else {
+                    const result = await createInMemoryDuckDBConnection();
+                    db = result.db;
+                    connection = result.connection;
+                }
+
+                const state = createInitialReplState(db, connection, args.persistent || false, args.database!);
+                terminalStore.setReplMode('duckdb', state);
+
+                const modeMsg = args.persistent
+                    ? ` (persistent: ${args.database}${wasRestored ? ', restored from save' : ''})`
+                    : ' (in-memory)';
+
+                return {
+                    content: `Entered DuckDB REPL${modeMsg}. Type .exit to quit, .help for help.`,
+                    type: CommandResultType.INFO
+                };
+            }
+
+            const { connection } = await createInMemoryDuckDBConnection();
+            const result = await executeSqlStatement(connection, sqlInput, 'table');
+            await closeConnection(connection);
+
+            return result;
+
+        } catch (error: unknown) {
+            const errorMessage = error instanceof Error ? error.message : String(error);
+            return {
+                content: `DuckDB Error: ${errorMessage}`,
+                type: CommandResultType.ERROR
+            };
+        }
+    }
+};
diff --git a/src/commands/index.ts b/src/commands/index.ts
index c434218..fc79659 100644
--- a/src/commands/index.ts
+++ b/src/commands/index.ts
@@ -10,6 +10,7 @@ import { mkdirCommand } from './mkdir';
 import { catCommand } from './cat';
 import { rmCommand } from './rm';
 import { catsayCommand } from './catsay';
+import { duckdbCommand } from './duckdb';
 
 export const commands = [
     helpCommand,
@@ -17,6 +18,7 @@ export const commands = [
     skillsCommand,
     projectsCommand,
     catsayCommand,
+    duckdbCommand,
     clearCommand,
     lsCommand,
     cdCommand,
diff --git a/src/components/Terminal.tsx b/src/components/Terminal.tsx
index c7f6a59..edc5490 100644
--- a/src/components/Terminal.tsx
+++ b/src/components/Terminal.tsx
@@ -13,7 +13,7 @@ export const FileSystemContext = createContext<WASMFileSystem | null>(null)
 const Terminal: React.FC = () => {
     const [input, setInput] = useState('');
     const terminalStore = useTerminalStore();
-    const { currentDirectory, addCommandToHistory } = terminalStore;
+    const { currentDirectory, addCommandToHistory, addDuckdbCommandToHistory, replMode } = terminalStore;
     const { output, setOutput, executeCommand, clearTerminal } = useTerminal(initialRender, terminalStore);
     const inputRef = useAutoFocus();
     const terminalRef = useRef<HTMLDivElement>(null);
@@ -23,17 +23,23 @@ const Terminal: React.FC = () => {
         const trimmedInput = input.trim();
         if (!trimmedInput) return;
 
-        addCommandToHistory(trimmedInput);
+        // Add to appropriate history based on REPL mode
+        if (replMode === 'duckdb') {
+            addDuckdbCommandToHistory(trimmedInput);
+        } else {
+            addCommandToHistory(trimmedInput);
+        }
+
         if (trimmedInput === 'clear') {
             clearTerminal();
         } else if (fileSystem) {
             const result = await executeCommand(trimmedInput, fileSystem);
-            const inputResult = { content: `${getPrompt(currentDirectory)}${input}`, type: CommandResultType.INPUT };
+            const inputResult = { content: `${getPrompt(currentDirectory, replMode)}${input}`, type: CommandResultType.INPUT };
             setOutput(prev => [...prev, inputResult, ...result]);
         }
         setInput('');
     // eslint-disable-next-line react-hooks/exhaustive-deps
-    }, [input, fileSystem, currentDirectory, addCommandToHistory, clearTerminal, executeCommand, setOutput]);
+    }, [input, fileSystem, currentDirectory, replMode, addCommandToHistory, addDuckdbCommandToHistory, clearTerminal, executeCommand, setOutput]);
 
     useKeyboardNavigation(inputRef, fileSystem as WASMFileSystem, getPreviousCommand, getNextCommand, setInput, clearTerminal, handleSubmit);
 
@@ -81,7 +87,7 @@ const Terminal: React.FC = () => {
                     ref={inputRef}
                     value={input}
                     onChange={(e) => setInput(e.target.value)}
-                    prompt={getPrompt(currentDirectory)}
+                    prompt={getPrompt(currentDirectory, replMode)}
                 />}
             </FileSystemContext.Provider>
         </div>
diff --git a/src/lib/duckdb/connection.ts b/src/lib/duckdb/connection.ts
new file mode 100644
index 0000000..d3d8a04
--- /dev/null
+++ b/src/lib/duckdb/connection.ts
@@ -0,0 +1,40 @@
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { loadDatabaseFromIndexedDB } from './persistence';
+
+export async function createInMemoryDuckDBConnection(): Promise<{
+  db: duckdb.AsyncDuckDB;
+  connection: duckdb.AsyncDuckDBConnection;
+}> {
+  const JSDELIVR_BUNDLES = duckdb.getJsDelivrBundles();
+  const bundle = await duckdb.selectBundle(JSDELIVR_BUNDLES);
+
+  const worker_url = URL.createObjectURL(
+    new Blob([`importScripts("${bundle.mainWorker}");`], { type: 'text/javascript' })
+  );
+
+  const worker = new Worker(worker_url);
+  const logger = new duckdb.ConsoleLogger();
+
+  const db = new duckdb.AsyncDuckDB(logger, worker);
+  await db.instantiate(bundle.mainModule);
+
+  const connection = await db.connect();
+
+  return { db, connection };
+}
+
+export async function createPersistentDuckDBConnection(dbName: string): Promise<{
+  db: duckdb.AsyncDuckDB;
+  connection: duckdb.AsyncDuckDBConnection;
+  wasRestored: boolean;
+}> {
+  const { db, connection } = await createInMemoryDuckDBConnection();
+
+  const wasRestored = await loadDatabaseFromIndexedDB(connection, dbName);
+
+  return { db, connection, wasRestored };
+}
+
+export async function closeConnection(connection: duckdb.AsyncDuckDBConnection): Promise<void> {
+  await connection.close();
+}
diff --git a/src/lib/duckdb/fileLoader.ts b/src/lib/duckdb/fileLoader.ts
new file mode 100644
index 0000000..59f5010
--- /dev/null
+++ b/src/lib/duckdb/fileLoader.ts
@@ -0,0 +1,48 @@
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { WASMFileSystem } from '@/utils/fileSystemUtils';
+
+export async function loadDatabaseFromWasmFilesystem(
+  db: duckdb.AsyncDuckDB,
+  wasmFs: WASMFileSystem,
+  filePath: string
+): Promise<void> {
+  const fileContent = wasmFs.readFile(filePath);
+  const encoder = new TextEncoder();
+  const binaryData = encoder.encode(fileContent);
+
+  await db.registerFileBuffer(filePath, binaryData);
+}
+
+export async function loadDatabaseFromLocalFile(
+  db: duckdb.AsyncDuckDB,
+  file: File
+): Promise<void> {
+  const arrayBuffer = await file.arrayBuffer();
+  const uint8Array = new Uint8Array(arrayBuffer);
+
+  const virtualPath = `/uploads/${file.name}`;
+  await db.registerFileBuffer(virtualPath, uint8Array);
+}
+
+export function promptForFileUpload(): Promise<File | null> {
+  return new Promise((resolve) => {
+    const input = document.createElement('input');
+    input.type = 'file';
+    input.accept = '.duckdb,.db';
+    input.style.display = 'none';
+
+    input.onchange = () => {
+      const file = input.files?.[0] || null;
+      document.body.removeChild(input);
+      resolve(file);
+    };
+
+    input.oncancel = () => {
+      document.body.removeChild(input);
+      resolve(null);
+    };
+
+    document.body.appendChild(input);
+    input.click();
+  });
+}
diff --git a/src/lib/duckdb/formatters.ts b/src/lib/duckdb/formatters.ts
new file mode 100644
index 0000000..6438968
--- /dev/null
+++ b/src/lib/duckdb/formatters.ts
@@ -0,0 +1,120 @@
+import * as arrow from 'apache-arrow';
+import { CommandResult, CommandResultType, TableCommandResult, TableType } from '@/types';
+import { OutputFormat } from './types';
+
+export function formatValue(value: unknown): string {
+  if (value === null || value === undefined) return 'NULL';
+  if (typeof value === 'string') return value;
+  if (typeof value === 'number') return value.toString();
+  if (typeof value === 'boolean') return value ? 'true' : 'false';
+  if (value instanceof Date) return value.toISOString();
+  return String(value);
+}
+
+export function formatAsTable(result: arrow.Table): TableCommandResult {
+  const rows: string[][] = [];
+  const headers = result.schema.fields.map((field: arrow.Field) => field.name);
+  rows.push(headers);
+
+  for (let i = 0; i < result.numRows; i++) {
+    const row: string[] = [];
+    for (let j = 0; j < result.numCols; j++) {
+      const column = result.getChildAt(j);
+      const value = column?.get(i);
+      row.push(formatValue(value));
+    }
+    rows.push(row);
+  }
+
+  return {
+    content: rows,
+    type: CommandResultType.TABLE,
+    tableType: TableType.NORMAL
+  };
+}
+
+function escapeCsvField(field: string): string {
+  if (field.includes(',') || field.includes('"') || field.includes('\n')) {
+    return `"${field.replace(/"/g, '""')}"`;
+  }
+  return field;
+}
+
+export function formatAsCSV(result: arrow.Table): CommandResult {
+  const lines: string[] = [];
+  const headers = result.schema.fields.map((f: arrow.Field) => f.name);
+  lines.push(headers.map(escapeCsvField).join(','));
+
+  for (let i = 0; i < result.numRows; i++) {
+    const row: string[] = [];
+    for (let j = 0; j < result.numCols; j++) {
+      const column = result.getChildAt(j);
+      const value = column?.get(i);
+      row.push(escapeCsvField(formatValue(value)));
+    }
+    lines.push(row.join(','));
+  }
+
+  return {
+    content: lines.join('\n'),
+    type: CommandResultType.TEXT
+  };
+}
+
+export function formatAsJSON(result: arrow.Table): CommandResult {
+  const rows: Record<string, unknown>[] = [];
+  const headers = result.schema.fields.map((f: arrow.Field) => f.name);
+
+  for (let i = 0; i < result.numRows; i++) {
+    const row: Record<string, unknown> = {};
+    for (let j = 0; j < result.numCols; j++) {
+      const column = result.getChildAt(j);
+      row[headers[j]] = column?.get(i);
+    }
+    rows.push(row);
+  }
+
+  return {
+    content: JSON.stringify(rows, null, 2),
+    type: CommandResultType.TEXT
+  };
+}
+
+export function formatAsMarkdown(result: arrow.Table): CommandResult {
+  const lines: string[] = [];
+  const headers = result.schema.fields.map((f: arrow.Field) => f.name);
+
+  lines.push('| ' + headers.join(' | ') + ' |');
+  lines.push('| ' + headers.map(() => '---').join(' | ') + ' |');
+
+  for (let i = 0; i < result.numRows; i++) {
+    const row: string[] = [];
+    for (let j = 0; j < result.numCols; j++) {
+      const column = result.getChildAt(j);
+      const value = column?.get(i);
+      row.push(formatValue(value));
+    }
+    lines.push('| ' + row.join(' | ') + ' |');
+  }
+
+  return {
+    content: lines.join('\n'),
+    type: CommandResultType.TEXT
+  };
+}
+
+export function formatQueryResult(
+  result: arrow.Table,
+  format: OutputFormat
+): CommandResult {
+  switch (format) {
+    case 'table':
+      return formatAsTable(result);
+    case 'csv':
+      return formatAsCSV(result);
+    case 'json':
+      return formatAsJSON(result);
+    case 'markdown':
+      return formatAsMarkdown(result);
+  }
+}
diff --git a/src/lib/duckdb/metaCommands.ts b/src/lib/duckdb/metaCommands.ts
new file mode 100644
index 0000000..afaa2b3
--- /dev/null
+++ b/src/lib/duckdb/metaCommands.ts
@@ -0,0 +1,348 @@
+import { CommandResult, CommandResultType } from '@/types';
+import { MetaCommand, DuckDBReplState, CommandContext, OutputFormat } from './types';
+import { executeSqlStatement } from './queryExecutor';
+import { exportDatabaseToIndexedDB, listSavedDatabases, deleteSavedDatabase } from './persistence';
+import { loadDatabaseFromWasmFilesystem, loadDatabaseFromLocalFile, promptForFileUpload } from './fileLoader';
+import { formatAsCSV, formatAsJSON } from './formatters';
+
+const META_COMMANDS: MetaCommand[] = [
+  {
+    name: '.tables',
+    description: 'List all tables',
+    usage: '.tables [PATTERN]',
+    handler: async (args, state) => {
+      const pattern = args[0] ? `WHERE name LIKE '${args[0]}'` : '';
+      return executeSqlStatement(
+        state.connection,
+        `SELECT name, estimated_size FROM duckdb_tables() ${pattern}`,
+        state.outputFormat
+      );
+    }
+  },
+  {
+    name: '.schema',
+    description: 'Show table schema',
+    usage: '.schema [TABLE_NAME]',
+    handler: async (args, state) => {
+      if (args[0]) {
+        return executeSqlStatement(state.connection, `DESCRIBE ${args[0]}`, state.outputFormat);
+      }
+      return executeSqlStatement(
+        state.connection,
+        `SELECT sql FROM duckdb_tables()`,
+        state.outputFormat
+      );
+    }
+  },
+  {
+    name: '.mode',
+    description: 'Set output format',
+    usage: '.mode table|csv|json|markdown',
+    handler: async (args, state) => {
+      const format = args[0] as OutputFormat;
+      if (!['table', 'csv', 'json', 'markdown'].includes(format)) {
+        throw new Error('Invalid format. Use: table, csv, json, or markdown');
+      }
+      state.outputFormat = format;
+      return {
+        content: `Output format set to: ${format}`,
+        type: CommandResultType.INFO
+      };
+    }
+  },
+  {
+    name: '.history',
+    description: 'Show query history',
+    usage: '.history [N]',
+    handler: async (args, state) => {
+      const count = args[0] ? parseInt(args[0]) : 20;
+      const recent = state.queryHistory.slice(-count);
+      if (recent.length === 0) {
+        return {
+          content: 'No query history',
+          type: CommandResultType.INFO
+        };
+      }
+      return {
+        content: recent.map((q, i) => `${i + 1}. ${q}`).join('\n'),
+        type: CommandResultType.TEXT
+      };
+    }
+  },
+  {
+    name: '.load',
+    description: 'Load .duckdb file',
+    usage: '.load local|PATH',
+    handler: async (args, state, context) => {
+      if (!args[0]) {
+        throw new Error('Usage: .load local|PATH');
+      }
+
+      if (args[0] === 'local') {
+        const file = await promptForFileUpload();
+        if (!file) {
+          return {
+            content: 'File upload cancelled',
+            type: CommandResultType.INFO
+          };
+        }
+
+        try {
+          await loadDatabaseFromLocalFile(state.db, file);
+          state.loadedFiles.push(file.name);
+          return {
+            content: `Loaded database file: ${file.name}`,
+            type: CommandResultType.SUCCESS
+          };
+        } catch (error) {
+          throw new Error(`Failed to load file: ${(error as Error).message}`);
+        }
+      } else {
+        const filePath = args[0];
+        try {
+          await loadDatabaseFromWasmFilesystem(state.db, context.fileSystem, filePath);
+          state.loadedFiles.push(filePath);
+          return {
+            content: `Loaded database file: ${filePath}`,
+            type: CommandResultType.SUCCESS
+          };
+        } catch (error) {
+          throw new Error(`Failed to load file: ${(error as Error).message}`);
+        }
+      }
+    }
+  },
+  {
+    name: '.import',
+    description: 'Import CSV/JSON file',
+    usage: '.import FILE_PATH TABLE_NAME',
+    handler: async (args, state) => {
+      if (args.length < 2) {
+        throw new Error('Usage: .import FILE_PATH TABLE_NAME');
+      }
+
+      const [filePath, tableName] = args;
+      const extension = filePath.toLowerCase().split('.').pop();
+
+      try {
+        if (extension === 'csv') {
+          await state.connection.query(
+            `CREATE TABLE ${tableName} AS SELECT * FROM read_csv_auto('${filePath}')`
+          );
+        } else if (extension === 'json') {
+          await state.connection.query(
+            `CREATE TABLE ${tableName} AS SELECT * FROM read_json_auto('${filePath}')`
+          );
+        } else {
+          throw new Error('Unsupported file format. Use .csv or .json');
+        }
+
+        return {
+          content: `Imported ${filePath} into table ${tableName}`,
+          type: CommandResultType.SUCCESS
+        };
+      } catch (error) {
+        throw new Error(`Failed to import file: ${(error as Error).message}`);
+      }
+    }
+  },
+  {
+    name: '.export',
+    description: 'Export table to file',
+    usage: '.export TABLE_NAME FILE_PATH [csv|json]',
+    handler: async (args, state, context) => {
+      if (args.length < 2) {
+        throw new Error('Usage: .export TABLE_NAME FILE_PATH [csv|json]');
+      }
+
+      const [tableName, filePath] = args;
+      const format = args[2] || filePath.toLowerCase().split('.').pop() || 'csv';
+
+      try {
+        const result = await state.connection.query(`SELECT * FROM ${tableName}`);
+
+        let fileContent: string;
+        if (format === 'csv') {
+          const csvResult = formatAsCSV(result);
+          fileContent = csvResult.content as string;
+        } else if (format === 'json') {
+          const jsonResult = formatAsJSON(result);
+          fileContent = jsonResult.content as string;
+        } else {
+          throw new Error('Unsupported format. Use csv or json');
+        }
+
+        context.fileSystem.writeFile(filePath, fileContent);
+
+        return {
+          content: `Exported ${tableName} to ${filePath}`,
+          type: CommandResultType.SUCCESS
+        };
+      } catch (error) {
+        throw new Error(`Failed to export table: ${(error as Error).message}`);
+      }
+    }
+  },
+  {
+    name: '.save',
+    description: 'Save database to IndexedDB',
+    usage: '.save [DB_NAME]',
+    handler: async (args, state) => {
+      const dbName = args[0] || state.dbName;
+      try {
+        await exportDatabaseToIndexedDB(state.connection, dbName);
+        state.isPersistent = true;
+        state.dbName = dbName;
+        return {
+          content: `Database saved as: ${dbName}`,
+          type: CommandResultType.SUCCESS
+        };
+      } catch (error) {
+        throw new Error(`Failed to save database: ${(error as Error).message}`);
+      }
+    }
+  },
+  {
+    name: '.databases',
+    description: 'List saved databases',
+    usage: '.databases',
+    handler: async () => {
+      const databases = await listSavedDatabases();
+      if (databases.length === 0) {
+        return {
+          content: 'No saved databases',
+          type: CommandResultType.INFO
+        };
+      }
+
+      const rows: string[][] = [['Name', 'Saved At']];
+      for (const db of databases) {
+        const date = new Date(db.timestamp).toLocaleString();
+        rows.push([db.name, date]);
+      }
+
+      return {
+        content: rows,
+        type: CommandResultType.TABLE
+      };
+    }
+  },
+  {
+    name: '.drop',
+    description: 'Delete a saved database',
+    usage: '.drop DB_NAME',
+    handler: async (args) => {
+      if (!args[0]) {
+        throw new Error('Database name required. Usage: .drop DB_NAME');
+      }
+
+      try {
+        await deleteSavedDatabase(args[0]);
+        return {
+          content: `Database '${args[0]}' deleted`,
+          type: CommandResultType.SUCCESS
+        };
+      } catch (error) {
+        throw new Error(`Failed to delete database: ${(error as Error).message}`);
+      }
+    }
+  },
+  {
+    name: '.help',
+    description: 'Show help',
+    usage: '.help [COMMAND]',
+    handler: async (args) => {
+      if (args[0]) {
+        const cmd = findMetaCommand(args[0]);
+        if (cmd) {
+          return {
+            content: `${cmd.name} - ${cmd.description}\nUsage: ${cmd.usage}`,
+            type: CommandResultType.INFO
+          };
+        }
+        return {
+          content: `Unknown command: ${args[0]}`,
+          type: CommandResultType.ERROR
+        };
+      }
+
+      const helpText = `
+DuckDB REPL Commands:
+
+Meta Commands:
+${META_COMMANDS.map(cmd => `  ${cmd.name.padEnd(20)} ${cmd.description}`).join('\n')}
+
+SQL Queries:
+  Type any SQL query and press Enter
+  Multi-line queries are supported (query continues until semicolon or complete statement)
+
+Output Formats:
+  table     - Table format (default)
+  csv       - Comma-separated values
+  json      - JSON array of objects
+  markdown  - Markdown table
+
+Examples:
+  CREATE TABLE users (id INT, name VARCHAR)
+  INSERT INTO users VALUES (1, 'Alice'), (2, 'Bob')
+  SELECT * FROM users
+  .mode json
+  SELECT * FROM users
+  .exit
+      `.trim();
+
+      return {
+        content: helpText,
+        type: CommandResultType.TEXT
+      };
+    }
+  },
+  {
+    name: '.exit',
+    aliases: ['.quit'],
+    description: 'Exit REPL',
+    usage: '.exit',
+    handler: async (args, state) => {
+      if (state.isPersistent) {
+        try {
+          await exportDatabaseToIndexedDB(state.connection, state.dbName);
+        } catch (error) {
+          console.error('Failed to auto-save on exit:', error);
+        }
+      }
+      return {
+        content: 'EXIT_REPL',
+        type: CommandResultType.INFO,
+        metadata: { shouldExit: true }
+      };
+    }
+  }
+];
+
+export function isMetaCommand(input: string): boolean {
+  return input.trim().startsWith('.');
+}
+
+export function findMetaCommand(input: string): MetaCommand | null {
+  const cmd = input.split(/\s+/)[0].toLowerCase();
+  return META_COMMANDS.find(
+    mc => mc.name === cmd || mc.aliases?.includes(cmd)
+  ) || null;
+}
+
+export async function executeMetaCommand(
+  input: string,
+  state: DuckDBReplState,
+  context: CommandContext
+): Promise<CommandResult> {
+  const parts = input.trim().split(/\s+/);
+  const commandName = parts[0];
+  const args = parts.slice(1);
+
+  const metaCmd = findMetaCommand(commandName);
+  if (!metaCmd) {
+    throw new Error(`Unknown meta command: ${commandName}. Type .help for available commands.`);
+  }
+
+  return await metaCmd.handler(args, state, context);
+}
diff --git a/src/lib/duckdb/persistence.ts b/src/lib/duckdb/persistence.ts
new file mode 100644
index 0000000..73f6084
--- /dev/null
+++ b/src/lib/duckdb/persistence.ts
@@ -0,0 +1,183 @@
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { SavedDatabase, IDB_NAME, IDB_VERSION, DB_STORE_NAME } from './types';
+import * as arrow from 'apache-arrow';
+
+export async function openIndexedDB(): Promise<IDBDatabase> {
+  return new Promise((resolve, reject) => {
+    const request = indexedDB.open(IDB_NAME, IDB_VERSION);
+
+    request.onerror = () => reject(request.error);
+    request.onsuccess = () => resolve(request.result);
+
+    request.onupgradeneeded = (event) => {
+      const db = (event.target as IDBOpenDBRequest).result;
+      if (!db.objectStoreNames.contains(DB_STORE_NAME)) {
+        db.createObjectStore(DB_STORE_NAME, { keyPath: 'name' });
+      }
+    };
+  });
+}
+
+async function getAllTableNames(connection: duckdb.AsyncDuckDBConnection): Promise<string[]> {
+  const result = await connection.query(`SELECT name FROM duckdb_tables() WHERE schema = 'main'`);
+  const names: string[] = [];
+
+  for (let i = 0; i < result.numRows; i++) {
+    const nameColumn = result.getChildAt(0);
+    const name = nameColumn?.get(i);
+    if (name) names.push(String(name));
+  }
+
+  return names;
+}
+
+async function getSchemaStatements(connection: duckdb.AsyncDuckDBConnection): Promise<string[]> {
+  const queries = [
+    `SELECT sql FROM duckdb_tables() WHERE schema = 'main'`,
+    `SELECT sql FROM duckdb_views() WHERE schema = 'main'`,
+    `SELECT sql FROM duckdb_indexes() WHERE schema = 'main'`
+  ];
+
+  const statements: string[] = [];
+
+  for (const query of queries) {
+    try {
+      const result = await connection.query(query);
+      for (let i = 0; i < result.numRows; i++) {
+        const sqlColumn = result.getChildAt(0);
+        const sql = sqlColumn?.get(i);
+        if (sql) statements.push(String(sql));
+      }
+    } catch {
+      // Some queries might fail if no views/indexes exist, that's okay
+      continue;
+    }
+  }
+
+  return statements;
+}
+
+export async function exportDatabaseToIndexedDB(
+  connection: duckdb.AsyncDuckDBConnection,
+  dbName: string
+): Promise<void> {
+  const tables = await getAllTableNames(connection);
+  const schema = await getSchemaStatements(connection);
+
+  const tablesData: Record<string, ArrayBuffer> = {};
+
+  for (const tableName of tables) {
+    const result = await connection.query(`SELECT * FROM ${tableName}`);
+
+    const writer = arrow.RecordBatchStreamWriter.writeAll(result);
+    const chunks: Uint8Array[] = [];
+
+    for await (const chunk of writer) {
+      chunks.push(chunk);
+    }
+
+    const totalLength = chunks.reduce((acc, chunk) => acc + chunk.length, 0);
+    const combined = new Uint8Array(totalLength);
+    let offset = 0;
+    for (const chunk of chunks) {
+      combined.set(chunk, offset);
+      offset += chunk.length;
+    }
+
+    tablesData[tableName] = combined.buffer;
+  }
+
+  const savedDb: SavedDatabase = {
+    name: dbName,
+    timestamp: Date.now(),
+    schema,
+    tables: tablesData
+  };
+
+  const db = await openIndexedDB();
+  const tx = db.transaction(DB_STORE_NAME, 'readwrite');
+  const store = tx.objectStore(DB_STORE_NAME);
+
+  await new Promise<void>((resolve, reject) => {
+    const request = store.put(savedDb);
+    request.onsuccess = () => resolve();
+    request.onerror = () => reject(request.error);
+  });
+
+  db.close();
+}
+
+export async function loadDatabaseFromIndexedDB(
+  connection: duckdb.AsyncDuckDBConnection,
+  dbName: string
+): Promise<boolean> {
+  const db = await openIndexedDB();
+  const tx = db.transaction(DB_STORE_NAME, 'readonly');
+  const store = tx.objectStore(DB_STORE_NAME);
+
+  const savedDb = await new Promise<SavedDatabase | null>((resolve, reject) => {
+    const request = store.get(dbName);
+    request.onsuccess = () => resolve(request.result || null);
+    request.onerror = () => reject(request.error);
+  });
+
+  db.close();
+
+  if (!savedDb) {
+    return false;
+  }
+
+  for (const ddl of savedDb.schema) {
+    try {
+      await connection.query(ddl);
+    } catch (error) {
+      console.error(`Failed to execute DDL: ${ddl}`, error);
+      throw error;
+    }
+  }
+
+  for (const [tableName, arrowBuffer] of Object.entries(savedDb.tables)) {
+    const uint8Array = new Uint8Array(arrowBuffer);
+    await connection.insertArrowFromIPCStream(uint8Array, {
+      name: tableName
+    });
+  }
+
+  return true;
+}
+
+export async function listSavedDatabases(): Promise<Array<{ name: string; timestamp: number }>> {
+  const db = await openIndexedDB();
+  const tx = db.transaction(DB_STORE_NAME, 'readonly');
+  const store = tx.objectStore(DB_STORE_NAME);
+
+  const databases = await new Promise<Array<{ name: string; timestamp: number }>>((resolve, reject) => {
+    const request = store.getAll();
+    request.onsuccess = () => {
+      const results = request.result.map((db: SavedDatabase) => ({
+        name: db.name,
+        timestamp: db.timestamp
+      }));
+      resolve(results);
+    };
+    request.onerror = () => reject(request.error);
+  });
+
+  db.close();
+
+  return databases;
+}
+
+export async function deleteSavedDatabase(dbName: string): Promise<void> {
+  const db = await openIndexedDB();
+  const tx = db.transaction(DB_STORE_NAME, 'readwrite');
+  const store = tx.objectStore(DB_STORE_NAME);
+
+  await new Promise<void>((resolve, reject) => {
+    const request = store.delete(dbName);
+    request.onsuccess = () => resolve();
+    request.onerror = () => reject(request.error);
+  });
+
+  db.close();
+}
diff --git a/src/lib/duckdb/queryExecutor.ts b/src/lib/duckdb/queryExecutor.ts
new file mode 100644
index 0000000..605b12f
--- /dev/null
+++ b/src/lib/duckdb/queryExecutor.ts
@@ -0,0 +1,42 @@
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { CommandResult, CommandResultType } from '@/types';
+import { OutputFormat } from './types';
+import { formatQueryResult } from './formatters';
+
+export type QueryType = 'SELECT' | 'DML' | 'DDL';
+
+export function detectQueryType(sql: string): QueryType {
+  const trimmed = sql.trim().toUpperCase();
+  if (/^(SELECT|SHOW|DESCRIBE|EXPLAIN|PRAGMA)/.test(trimmed)) {
+    return 'SELECT';
+  }
+  if (/^(INSERT|UPDATE|DELETE)/.test(trimmed)) {
+    return 'DML';
+  }
+  return 'DDL';
+}
+
+export async function executeSqlStatement(
+  connection: duckdb.AsyncDuckDBConnection,
+  sql: string,
+  format: OutputFormat = 'table'
+): Promise<CommandResult> {
+  const queryType = detectQueryType(sql);
+
+  if (queryType === 'SELECT') {
+    const result = await connection.query(sql);
+
+    if (result.numRows === 0) {
+      return {
+        type: CommandResultType.SUCCESS
+      };
+    }
+
+    return formatQueryResult(result, format);
+  } else {
+    await connection.query(sql);
+    return {
+      type: CommandResultType.SUCCESS
+    };
+  }
+}
diff --git a/src/lib/duckdb/sqlParser.ts b/src/lib/duckdb/sqlParser.ts
new file mode 100644
index 0000000..02eb458
--- /dev/null
+++ b/src/lib/duckdb/sqlParser.ts
@@ -0,0 +1,47 @@
+export function isCompleteSqlStatement(sql: string): boolean {
+  const trimmed = sql.trim();
+
+  if (!trimmed) return true;
+  if (trimmed.startsWith('.')) return true;
+
+  if (trimmed.endsWith(';')) return true;
+
+  let parenDepth = 0;
+  let inString = false;
+  let stringChar = '';
+
+  for (let i = 0; i < trimmed.length; i++) {
+    const char = trimmed[i];
+    const prevChar = i > 0 ? trimmed[i - 1] : '';
+
+    if ((char === "'" || char === '"') && prevChar !== '\\') {
+      if (!inString) {
+        inString = true;
+        stringChar = char;
+      } else if (char === stringChar) {
+        inString = false;
+      }
+    }
+
+    if (!inString) {
+      if (char === '(') parenDepth++;
+      if (char === ')') parenDepth--;
+    }
+  }
+
+  if (inString || parenDepth !== 0) {
+    return false;
+  }
+
+  const endsWithMultilineKeyword = /\b(SELECT|FROM|WHERE|JOIN|INNER|LEFT|RIGHT|OUTER|ON|GROUP|ORDER|HAVING|UNION|INTERSECT|EXCEPT|WITH|AS|AND|OR|WHEN|THEN|ELSE|CASE|VALUES|SET)\s*$/i.test(trimmed);
+
+  if (endsWithMultilineKeyword) {
+    return false;
+  }
+
+  return true;
+}
+
+export function appendToMultilineBuffer(buffer: string, newLine: string): string {
+  return buffer ? `${buffer}\n${newLine}` : newLine;
+}
diff --git a/src/lib/duckdb/types.ts b/src/lib/duckdb/types.ts
new file mode 100644
index 0000000..892ff58
--- /dev/null
+++ b/src/lib/duckdb/types.ts
@@ -0,0 +1,52 @@
+import * as duckdb from '@duckdb/duckdb-wasm';
+import { CommandResult } from '@/types';
+import { TerminalStore } from '@/store';
+import { WASMFileSystem } from '@/utils';
+
+export type OutputFormat = 'table' | 'csv' | 'json' | 'markdown';
+
+export interface DuckDBReplState {
+  connection: duckdb.AsyncDuckDBConnection;
+  db: duckdb.AsyncDuckDB;
+  sessionId: string;
+  dbName: string;
+  isPersistent: boolean;
+  queryHistory: string[];
+  outputFormat: OutputFormat;
+  multilineBuffer: string;
+  loadedFiles: string[];
+}
+
+export interface CommandContext {
+  terminalStore: TerminalStore;
+  fileSystem: WASMFileSystem;
+}
+
+export interface MetaCommand {
+  name: string;
+  aliases?: string[];
+  description: string;
+  usage: string;
+  handler: MetaCommandHandler;
+}
+
+export type MetaCommandHandler = (
+  args: string[],
+  state: DuckDBReplState,
+  context: CommandContext
+) => Promise<CommandResult>;
+
+export interface SavedDatabase {
+  name: string;
+  timestamp: number;
+  schema: string[];
+  tables: Record<string, ArrayBuffer>;
+}
+
+export const DEFAULT_DB_NAME = 'terminal_database';
+export const MAX_QUERY_HISTORY = 100;
+export const REPL_PROMPT = 'duckdb> ';
+export const MULTILINE_PROMPT = '      -> ';
+export const IDB_NAME = 'terminal_duckdb_storage';
+export const IDB_VERSION = 1;
+export const DB_STORE_NAME = 'duckdb_databases';
diff --git a/src/store/terminalStore.ts b/src/store/terminalStore.ts
index db917b0..b990dd9 100644
--- a/src/store/terminalStore.ts
+++ b/src/store/terminalStore.ts
@@ -4,30 +4,48 @@ import { terminalConfig } from '@/config'
 
 export interface TerminalStore extends TerminalState {
   addCommandToHistory: (command: string) => void
+  addDuckdbCommandToHistory: (command: string) => void
   setHistoryIndex: (index: number) => void
+  setDuckdbHistoryIndex: (index: number) => void
   setOutputStream: (stream: TerminalOutputStream, streamInfo?: FileOutputStream) => void
   changeDirectory: (newDirectory: string) => void
+  setReplMode: (mode: string | null, data?: unknown) => void
 }
 
 export const useTerminalStore = create<TerminalStore>((set) => ({
   commandHistory: [],
+  duckdbCommandHistory: [],
   user: terminalConfig.user,
   host: terminalConfig.host,
   outputStream: TerminalOutputStream.STDOUT,
   currentDirectory: terminalConfig.initialDirectory,
   historyIndex: 0,
+  duckdbHistoryIndex: 0,
+  replMode: null,
+  replData: null,
   addCommandToHistory: (command) => set((state) => ({
     commandHistory: [...state.commandHistory, command],
     historyIndex: state.commandHistory.length + 1
   })),
+  addDuckdbCommandToHistory: (command) => set((state) => ({
+    duckdbCommandHistory: [...state.duckdbCommandHistory, command],
+    duckdbHistoryIndex: state.duckdbCommandHistory.length + 1
+  })),
   setHistoryIndex: (index) => set(() => ({
     historyIndex: index
   })),
+  setDuckdbHistoryIndex: (index) => set(() => ({
+    duckdbHistoryIndex: index
+  })),
   setOutputStream: (stream, streamInfo) => set(() => ({
     outputStream: stream,
     ...streamInfo ? { streamInfo } : {}
   })),
   changeDirectory: (newDirectory) => set({ currentDirectory: newDirectory }),
+  setReplMode: (mode, data) => set(() => ({
+    replMode: mode,
+    replData: data
+  })),
 }));
 
 export const getOutputStream = () => {
@@ -40,10 +58,13 @@ export const getOutputStream = () => {
 
 export const getPreviousCommand = () => {
   const state = useTerminalStore.getState();
-  const commandHistory = state.commandHistory;
-  const historyIndex = state.historyIndex;
+  const isDuckdbMode = state.replMode === 'duckdb';
+  const commandHistory = isDuckdbMode ? state.duckdbCommandHistory : state.commandHistory;
+  const historyIndex = isDuckdbMode ? state.duckdbHistoryIndex : state.historyIndex;
+  const setIndex = isDuckdbMode ? state.setDuckdbHistoryIndex : state.setHistoryIndex;
+
   if (historyIndex > 0) {
-    state.setHistoryIndex(historyIndex - 1);
+    setIndex(historyIndex - 1);
     return commandHistory[historyIndex - 1];
   } else {
     return null;
@@ -52,13 +73,16 @@ export const getPreviousCommand = () => {
 
 export const getNextCommand = () => {
   const state = useTerminalStore.getState();
-  const commandHistory = state.commandHistory;
-  const historyIndex = state.historyIndex;
+  const isDuckdbMode = state.replMode === 'duckdb';
+  const commandHistory = isDuckdbMode ? state.duckdbCommandHistory : state.commandHistory;
+  const historyIndex = isDuckdbMode ? state.duckdbHistoryIndex : state.historyIndex;
+  const setIndex = isDuckdbMode ? state.setDuckdbHistoryIndex : state.setHistoryIndex;
+
   if (historyIndex < commandHistory.length - 1) {
-    state.setHistoryIndex(historyIndex + 1);
+    setIndex(historyIndex + 1);
     return commandHistory[historyIndex + 1];
   } else if (historyIndex === commandHistory.length - 1) {
-    state.setHistoryIndex(commandHistory.length);
+    setIndex(commandHistory.length);
     return '';
   }
   return null;
diff --git a/src/types/terminal.ts b/src/types/terminal.ts
index d270d3b..6b9f097 100644
--- a/src/types/terminal.ts
+++ b/src/types/terminal.ts
@@ -21,6 +21,10 @@ export interface TerminalState {
     currentDirectory: string;
     commandHistory: string[];
     historyIndex: number;
+    duckdbCommandHistory: string[];
+    duckdbHistoryIndex: number;
+    replMode: string | null;
+    replData: unknown;
 }
 
 export type CommandHandler = (command: string) => string;
@@ -39,6 +43,7 @@ export enum CommandResultType {
 export interface CommandResult {
     content?: string[][] | ReactNode;
     type: CommandResultType;
+    metadata?: Record<string, unknown>;
 }
 
 export enum TableType {
diff --git a/src/utils/commandHandler.ts b/src/utils/commandHandler.ts
index 89af83d..8a3ea03 100644
--- a/src/utils/commandHandler.ts
+++ b/src/utils/commandHandler.ts
@@ -6,6 +6,26 @@ import { WASMFileSystem } from './fileSystemUtils';
 import { ArgumentParserError, ArgumentTypeError, InvalidChoiceError, InvalidNargsError, MissingRequiredArgumentError, UnknownArgumentError } from 'js-argparse';
 
 export const handleCommand = async (input: string, terminalStore: TerminalStore, fileSystem: WASMFileSystem): Promise<CommandResult[]> => {
+  // Check if we're in REPL mode
+  if (terminalStore.replMode) {
+    // Route input to the REPL command
+    const replCommand = commands.find(cmd => cmd.name === terminalStore.replMode);
+    if (replCommand) {
+      try {
+        // In REPL mode, treat the entire input as a single argument to the REPL command
+        const parsedArgs = replCommand.args.parseArgs(input);
+        const result = await replCommand.execute({ terminalStore, fileSystem }, parsedArgs);
+        return Array.isArray(result) ? result : [result];
+      } catch (error: unknown) {
+        console.error(`Error in REPL mode:`, error);
+        return [{
+          content: `REPL Error: ${(error as Error).message}`,
+          type: CommandResultType.ERROR
+        }];
+      }
+    }
+  }
+
   const { command: commandName, args, file } = parseCommand(input);
   if (file) {
     terminalStore.setOutputStream(TerminalOutputStream.FILE, { name: file });
diff --git a/src/utils/terminalUtils.ts b/src/utils/terminalUtils.ts
index 8f34783..93d8e45 100644
--- a/src/utils/terminalUtils.ts
+++ b/src/utils/terminalUtils.ts
@@ -2,9 +2,10 @@ import { ParsedCommand } from '@/types';
 import { terminalConfig } from '@/config';
 import { HOME_DIR } from '@/config/terminalConfig';
 
-export const getPrompt = (currentDirectory: string): string => {
+export const getPrompt = (currentDirectory: string, replMode?: string | null): string => {
   const homeDirectoryRegex = new RegExp(`^${HOME_DIR}`);
-  return `${terminalConfig.user}@${terminalConfig.host}:${currentDirectory.replace(homeDirectoryRegex,'~')}$ `;
+  const basePrompt = `${terminalConfig.user}@${terminalConfig.host}:${currentDirectory.replace(homeDirectoryRegex, '~')}`;
+  return replMode ? `${replMode}> ` : `${basePrompt}$ `;
 };
 
 export const parseCommand = (input: string): ParsedCommand => {