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+# Snapshot
+
+## Overview
+
+Data that has reached a finalized state and won't undergo further changes (essentially frozen) should be read without concerns of modification. This makes it unsuitable for traditional databases.
+
+This crate aims to copy this data from the current database to multiple static files, aggregated by block ranges. At every 500_000th block new static files are created.
+
+Below are two diagrams illustrating the processes of creating static files (custom format: `NippyJar`) and querying them. A glossary is also provided to explain the different (linked) components involved in these processes.
+
+<details>
+  <summary>Creation diagram (<code>Snapshotter</code>)</summary>
+
+```mermaid
+graph TD;
+    I("BLOCK_HEIGHT % 500_000 == 0")--triggers-->SP(Snapshotter)
+    SP --> |triggers| SH["create_snapshot(block_range, SnapshotSegment::Headers)"]
+    SP --> |triggers| ST["create_snapshot(block_range, SnapshotSegment::Transactions)"]
+    SP --> |triggers| SR["create_snapshot(block_range, SnapshotSegment::Receipts)"]
+    SP --> |triggers| ETC["create_snapshot(block_range, ...)"]
+    SH --> CS["create_snapshot::&lt; T &gt;(DatabaseCursor)"]
+    ST --> CS
+    SR --> CS
+    ETC --> CS
+    CS --> |create| IF(NippyJar::InclusionFilters)
+    CS -- iterates --> DC(DatabaseCursor) -->HN{HasNext} 
+    HN --> |true| NJC(NippyJar::Compression)
+    NJC --> HN
+    NJC --store--> NJ
+    HN --> |false| NJ 
+    IF --store--> NJ(NippyJar)
+    NJ --freeze--> F(File)
+    F--"on success"--> SP1(Snapshotter)
+    SP1 --"sends BLOCK_HEIGHT"--> HST(HighestSnapshotTracker)
+    HST --"read by"-->Pruner
+    HST --"read by"-->DatabaseProvider
+    HST --"read by"-->SnapsotProvider
+    HST --"read by"-->ProviderFactory
+
+```
+</details>
+
+
+<details>
+  <summary>Query diagram (<code>Provider</code>)</summary>
+
+```mermaid
+graph TD;
+    RPC-->P
+    P("Provider::header(block_number)")-->PF(ProviderFactory)
+    PF--shares-->SP1("Arc(SnapshotProvider)")
+    SP1--shares-->PD(DatabaseProvider)
+    PF--creates-->PD
+    PD--check `HighestSnapshotTracker`-->PD
+    PD-->DC1{block_number <br> > <br> highest snapshot block}
+    DC1 --> |true| PD1("DatabaseProvider::header(block_number)")
+    DC1 --> |false| ASP("SnapshotProvider::header(block_number)")
+    PD1 --> MDBX
+    ASP --find correct jar and creates--> JP("SnapshotJarProvider::header(block_number)")
+    JP --"creates"-->SC(SnapshotCursor)
+    SC --".get_one&lt; HeaderMask&lt; Header  &gt; &gt;(number)"--->NJC("NippyJarCursor")
+    NJC--".row_by_number(row_index, mask)"-->NJ[NippyJar]
+    NJ--"&[u8]"-->NJC
+    NJC--"&[u8]"-->SC
+    SC--"Header"--> JP
+    JP--"Header"--> ASP
+```
+</details>
+
+
+### Glossary
+In descending order of abstraction hierarchy:
+
+[`Snapshotter`](../../crates/snapshot/src/snapshotter.rs#L20): A `reth` background service that **copies** data from the database to new snapshot files when the block height reaches a certain threshold (e.g., `500_000th`). Upon completion, it dispatches a notification about the higher snapshotted block to `HighestSnapshotTracker` channel. **It DOES NOT remove data from the database.**
+
+[`HighestSnapshotTracker`](../../crates/snapshot/src/snapshotter.rs#L22): A channel utilized by `Snapshotter` to announce the newest snapshot block to all components with a listener: `Pruner` (to know which additional tables can be pruned) and `DatabaseProvider`  (to know which data can be queried from the snapshots).
+
+[`SnapshotProvider`](../../crates/storage/provider/src/providers/snapshot/manager.rs#L15) A provider similar to `DatabaseProvider`, **managing all existing snapshot files** and selecting the optimal one (by range and segment type) to fulfill a request. **A single instance is shared across all components and should be instantiated only once within `ProviderFactory`**. An immutable reference is given everytime `ProviderFactory` creates a new `DatabaseProvider`.
+
+[`SnapshotJarProvider`](../../crates/storage/provider/src/providers/snapshot/jar.rs#L42) A provider similar to `DatabaseProvider` that provides access to a **single snapshot file**.
+
+[`SnapshotCursor`](../../crates/storage/db/src/snapshot/cursor.rs#L12) An elevated abstraction of `NippyJarCursor` for simplified access. It associates the bitmasks with type decoding. For instance, `cursor.get_two::<TransactionMask<Tx, Signature>>(tx_number)` would yield `Tx` and `Signature`, eliminating the need to manage masks or invoke a decoder/decompressor.
+
+[`SnapshotSegment`](../../crates/primitives/src/snapshot/segment.rs#L10) Each snapshot file only contains data of a specific segment, e.g., `Headers`, `Transactions`, or `Receipts`.
+
+[`NippyJarCursor`](../../crates/storage/nippy-jar/src/cursor.rs#L12) Accessor of data in a `NippyJar` file. It enables queries either by row number (e.g., block number 1) or by a predefined key not part of the file (e.g., transaction hashes). If a file has multiple columns (e.g., `Tx | TxSender | Signature`), and one wishes to access only one of the column values, this can be accomplished by bitmasks. (e.g., for `TxSender`, the mask would be `0b010`).
+
+[`NippyJar`](../../crates/storage/nippy-jar/src/lib.rs#57) A create-only file format. No data can be appended after creation. It supports multiple columns, compression (e.g., Zstd (with and without dictionaries), lz4, uncompressed) and inclusion filters (e.g., cuckoo filter: `is hash X part of this dataset`). Snapshots are organized by block ranges. (e.g., `TransactionSnapshot_499_999.jar` contains a transaction per row for all transactions from block `0` to block `499_999`). For more check the struct documentation.