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eDB

Embedded Database

Lightweight embedded database engine with key-value, document, and time-series storage — all with ACID guarantees and flash wear-leveling.

Platform FoundationCActive Development

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Key Features

Key-Value Store — B+ tree, O(log n) lookups

Document Store — BSON with nested field queries

Time-Series Engine — Append-only with downsampling

ACID Transactions — WAL with crash recovery

Flash Wear Leveling — Intelligent block allocation

Tiny Footprint — 32 KB ROM, 4 KB min RAM

AES-256 Encryption at Rest

Architecture

Application Interface (KV, Document, Time-Series APIs)
├── Query Engine (Parser, Planner, Executor)
├── Storage Engine (B+ Tree, LSM Tree, WAL)
├── Flash Translation Layer (Wear Leveling, Compaction)
└── Hardware (NOR/NAND Flash, eMMC, SD)

Code Example

#include <edb/edb.h>

edb_t *db;
edb_config_t config = {
    .path = "/flash/health_data",
    .max_size = 1024 * 1024,
    .encryption = EDB_ENCRYPT_AES256,
    .wear_leveling = true
};
edb_open(&db, &config);

edb_kv_put(db, "user.name", "Patient_001", 11);

edb_ts_t *ts;
edb_ts_create(db, &ts, "heartrate",
    EDB_TS_FLOAT32, EDB_TS_DOWNSAMPLE_AVG);
float hr = 72.5f;
edb_ts_append(ts, eos_kernel_get_tick(), &hr);

API Highlights

Function	Description
`edb_open() / edb_close()`	Open/close database
`edb_kv_put() / edb_kv_get()`	Key-value store/retrieve
`edb_ts_append()`	Append time-series data point
`edb_doc_insert()`	Insert JSON document
`edb_txn_begin()`	Begin transaction

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