docs(filters): added legacy

docs/pages/v2/filters.mdx

@@ -9,9 +9,6 @@ These are the existing filters that are included as part the main _Oura_ codebas
 - [ParseCbor](filters/parse_cbor.mdx): a filter that maps cbor transactions to a data structure.
 - [SplitBlock](filters/split_block.mdx): a filter that will decode the cbor block and extract all transactions in an event in the format CborTx.
 - [Deno](filters/deno.mdx): a filter that allows JS code to be implemented as a stage within the pipeline.
-
-### Legacy V1
-- [Fingerprint](filters/fingerprint.mdx): a filter that adds a (probably) unique identifier (fingerprint) to each event.
-- [Selection](filters/selection.mdx): a filter that evaluates different built-in predicates to decide which events should go through the pipeline.
+- [Legacy V1](filters/legacy_v1.mdx): a filter that transforms the block data to the Oura V1 data structure.
 
 New filters are being developed, information will be added in this documentation to reflect the updated list. Contributions and feature request are welcome in our [Github Repo](https://github.com/txpipe/oura).

docs/pages/v2/filters/legacy_v1.mdx

@@ -0,0 +1,61 @@
+# Legacy V1 filter
+
+Transforms the block data to the Oura V1 data structure. This filter is ideal for compatibility with systems that are using Oura V1 and want to migrate without much work.
+
+## Configuration
+
+Adding the following section to the daemon config file will enable the filter as part of the pipeline:
+
+```toml
+[[filters]]
+type = "LegacyV1"
+include_block_end_events = false
+include_transaction_details = false
+include_transaction_end_events = false
+include_block_details = false
+include_block_cbor = false
+include_byron_ebb = false
+```
+
+### Section `LegacyV1`
+
+- `type`: the literal value `LegacyV1`.
+- `include_block_end_events`: if enabled, the source will output an event signaling the end of a block, duplicating all of the data already sent in the corresponding block start event. Default value is `false`.
+- `include_transaction_details`: if enabled, each transaction event payload will contain an nested version of all of the details of the transaction (inputs, outputs, mint, assets, metadata, etc). Useful when the pipeline needs to process the tx as a unit, instead of handling each sub-object as an independent event. Default value is `false`.
+- `include_transaction_end_events`: if enabled, the source will output an event signaling the end of a transaction, duplicating all of the data already sent in the corresponding transaction start event. Defaul value is `false`.
+- `include_block_cbor`: if enabled, the block event will include the raw, unaltered cbor content received from the node, formatted as an hex string. Useful when some custom cbor decoding is required. Default value is `false`.
+- `include_byron_ebb`: if enabled, a block event will be emmitted for legacy epoch boundary block of the Byron era (deprecated in newer eras). Useful when performing validation on previous block hashes. Default value is `false`.
+- `include_block_details`: If enabled, will be added the basic details of each transaction. Default value is `false`.
+
+## Examples
+
+Below is an example of the data that will be sent to the sink with all settings disabled.
+
+```json
+{
+  "event": "apply",
+  "point": {
+    "slot": 100110525,
+    "hash": "c808fc4142c5f10a2a6d0922edbd23972100d7d22e2255206bd05e968cc045f1"
+  },
+  "record": {
+    "context": {
+      "block_hash": "c808fc4142c5f10a2a6d0922edbd23972100d7d22e2255206bd05e968cc045f1",
+      "block_number": 9142145,
+      "slot": 100110525,
+      "timestamp": 1691676816,
+      "tx_idx": 6,
+      "tx_hash": "4329140c6711f2197c8c81bfff4b75fb95892375050dafda30ba146476ca3d65",
+      "input_idx": null,
+      "output_idx": null,
+      "output_address": null,
+      "certificate_idx": null
+    },
+    "collateral": {
+      "tx_id": "981881a382a41f85140076b088a93456a999e6cd2796a28c0a8c7858cea40175",
+      "index": 4
+    },
+    "fingerprint": null
+  }
+}
+```