Use sqlite-vec extension instead of chromadb for embeddings (#14163)

* swap sqlite_vec for chroma in requirements

* load sqlite_vec in embeddings manager

* remove chroma and revamp Embeddings class for sqlite_vec

* manual minilm onnx inference

* remove chroma in clip model

* migrate api from chroma to sqlite_vec

* migrate event cleanup from chroma to sqlite_vec

* migrate embedding maintainer from chroma to sqlite_vec

* genai description for sqlite_vec

* load sqlite_vec in main thread db

* extend the SqliteQueueDatabase class and use peewee db.execute_sql

* search with Event type for similarity

* fix similarity search

* install and add comment about transformers

* fix normalization

* add id filter

* clean up

* clean up

* fully remove chroma and add transformers env var

* readd uvicorn for fastapi

* readd tokenizer parallelism env var

* remove chroma from docs

* remove chroma from UI

* try removing custom pysqlite3 build

* hard code limit

* optimize queries

* revert explore query

* fix query

* keep building pysqlite3

* single pass fetch and process

* remove unnecessary re-embed

* update deps

* move SqliteVecQueueDatabase to db directory

* make search thumbnail take up full size of results box

* improve typing

* improve model downloading and add status screen

* daemon downloading thread

* catch case when semantic search is disabled

* fix typing

* build sqlite_vec from source

* resolve conflict

* file permissions

* try build deps

* remove sources

* sources

* fix thread start

* include git in build

* reorder embeddings after detectors are started

* build with sqlite amalgamation

* non-platform specific

* use wget instead of curl

* remove unzip -d

* remove sqlite_vec from requirements and load the compiled version

* fix build

* avoid race in db connection

* add scale_factor and bias to description zscore normalization

docker/main/requirements-wheels.txt

@@ -2,6 +2,7 @@ click == 8.1.*
 # FastAPI
 starlette-context == 0.3.6
 fastapi == 0.115.0
+uvicorn == 0.30.*
 slowapi == 0.1.9
 imutils == 0.5.*
 joserfc == 1.0.*
@@ -32,12 +33,12 @@ unidecode == 1.3.*
 # OpenVino (ONNX installed in wheels-post)
 openvino == 2024.3.*
 # Embeddings
-chromadb == 0.5.7
+transformers == 4.45.*
 onnx_clip == 4.0.*
 # Generative AI
-google-generativeai == 0.6.*
-ollama == 0.2.*
-openai == 1.30.*
+google-generativeai == 0.8.*
+ollama == 0.3.*
+openai == 1.51.*
 # push notifications
 py-vapid == 1.9.*
 pywebpush == 2.0.*